Scientifique - 113 réponse(s) - Another research

Qu’est-ce que la gravité ? A book by Philippe Brax, Etienne Klein and Pierre Vanhove
26/06/2019
Qu’est-ce que la gravité ? A book by Philippe Brax, Etienne Klein and Pierre Vanhove
General relativity has just celebrated its centenary and the early detection of gravitational waves by LIGO and Virgo has confirmed Einstein's prediction that accelerated masses can produce an oscillation of space-time spreading at the speed of light.

24th Itzykson meeting: Effective Field Theory in Cosmology, Gravitation and Particle Physics, 5-7 juin 2019, IPhT
21/02/2019
24th Itzykson meeting: Effective Field Theory in Cosmology, Gravitation and Particle Physics, 5-7 juin 2019, IPhT
Organizing commitee: Brando Bellazzini, John Joseph Carrasco and Filippo Vernizzi

Maxime Grandadam et Giuliano Giacalone, étudiants à l'IPhT, invités à l'émission
30/01/2019
Maxime Grandadam et Giuliano Giacalone, étudiants à l'IPhT, invités à l'émission "La Recherche Montre en Main" de France-Culture
  Maxence Grandadam, en thèse sous la direction de Catherine Pépin , a été invité le 12 décembre 2018 à l'émission quotidienne de France Culture "la méthode scientifique", dans sa rubrique dédiée aux doctorants "La Recherche montre en Main" au cours de laquelle ils doivent exposer en 4 mn le sujet de leurs recherches. Giuliano Giacalone, étudiant sous la direction de Jean-Yves Ollitrault, a également été invité à s'exprimer à cette émission le mercredi 30 janvier 2019. Emission La Recherche Montre en Main Interview de Maxence Grandadam

Maximal Supergravity at Five Loops !
18/12/2018
Maximal Supergravity at Five Loops !
Single (top) vs double copy (bottom) theory This past year a team at IPhT around John Joseph Carrasco — in collaboration with physicists at UCLA and Penn State University in the United States, and Uppsala University in Sweden — completed a calculation long thought to be impossible: the direct understanding of the dimensions of space-time in which the most symmetric particle-based field theory of gravity (maximal supergravity) would cease to be predictive when quantum effects are relevant. One can isolate order by order the quantum effects in graviton scattering. For two gravitons scattering off of each other, this calculation required consideration of the fifth-order quantum correction. This puts strong constraints on the behavior of fundamental symmetries in controlling the high-energy behavior of this theory.
More

Shaking Strongly Correlated Electrons
13/12/2018
Shaking Strongly Correlated Electrons
Periodically driven quantum many-body systems (such as cold atoms in time-dependent optical lattices and quantum materials under ultra-fast optical excitation) offer exciting perspectives of exploring quantum phases of matter along genuine non-equilibrium pathways.This so-called Floquet engineering relies, however, on the suppression of heating, i.e. the uncontrolled energy absorption from the drive. This was known to be the case only in the limit of extremely high frequency,thus limiting its practical use. A team at IPhT around Francesco Peronaci, Marco Schiro and Olivier Parcollet showed that also strong electronic interactions can largely circumvent energy absorption, and thus provide a robust platform for Floquet engineering even at finite frequency. This is demonstrated with non-equilibrium dynamical mean-field calculations on a driven Fermi-Hubbard model, a paradigmatic example of lattice correlated electrons.
More

Matière noire : la théorie des trous noirs disqualifiée
12/12/2018
Matière noire : la théorie des trous noirs disqualifiée
Selon Miguel Zumalacarregui, de l'IPhT, et son collaborateur Uros Seljak, la matière noire ne peut être intégralement constituée de trous noirs de masse supérieure à un centième de la masse solaire. Il faut donc aussi chercher du côté des particules élémentaires pour démasquer la matière noire!

Giulio Biroli lauréat 2018 du Prix d'Aumale de l'Académie des Sciences
27/11/2018
Giulio Biroli lauréat 2018 du Prix d'Aumale de l'Académie des Sciences
Le Prix d'Aumale (fondation de l'Institut de France), créé en 1866, est un prix annuel décerné sur proposition de chacune des cinq Académies. Il est décerné tous les 5 ans par l'Académie des Sciences. Les travaux théoriques de Giulio Biroli ont concerné de nombreux aspects de la physique statistique des milieux désordonnés, tels les verres ou les matériaux amorphes. Il a montré que ces milieux présentent des phénomènes de vieillissement caractéristiques du désordre.  Dans ces phases, la théorie usuelle de l'élasticité est perdue.
More

Michel Gaudin recipient of the 2019 Dannie Heineman APS/AIP Prize for Mathematical Physics
31/10/2018
Michel Gaudin recipient of the 2019 Dannie Heineman APS/AIP Prize for Mathematical Physics
We are happy to learn that Michel Gaudin has been awarded the 2019 Dannie Heineman Prize for Mathematical Physics, together with Bill Sutherland (U. of Utah) and F. Calogero (U. di Roma La Sapienza), for their "... profound contributions to the field of exactly solvable models in statistical mechanics and many body physics, in particular the construction of the widely studied Gaudin magnet and the Calogero-Sutherland, Shastry-Sutherland, and Calogero-Moser models." This prize was established in 1959 by the Heineman Foundation for Research, Educational, Charitable, and Scientific Purposes, Inc., and is administered jointly by the American Physical Society and the American Institute of Physics. It recognizes outstanding publications in the field of mathematical physics. Michel Gaudin entered CEA in 1956 and is one of the "grands anciens" of what is now IPhT.
More

ReNewQuantum: ERC Synergy Grant at the Interface of Mathematics and Theoretical Physics
23/10/2018
ReNewQuantum: ERC Synergy Grant at the Interface of Mathematics and Theoretical Physics
Bertrand Eynard (IPhT) has been awarded an ERC Synergy grant, "Recursive and Exact New Quantum Theory", together with J.E. Andersen (QGM, Aarhus University, DK), B. Eynard (IPhT), Mr. Kontsevich (IHES, Bures-sur-Yvette) and M. Mariño (UNIGE, Geneva, CH). Two other IPhT researchers are involved in this project. The Synergy Grants aim to establish collaborations between several researchers in different institutes on a common program. The goal of the ReNewQuantun program is to build new foundations for quantum field theory, beyond perturbation theory, by using advanced geometric and topological methods (topological recursion, geometric recursion, resurgence theory, non-linear Riemann-Hilbert methods, Fukaya categories, topological string theories, mirror symmetry, etc.). This program should open new avenues for exploring the relations between gravitation and quantum mechanics, and for incorporating it into unified theories of fundamental interactions.
More

« A la recherche des neutrinos » un livre de A. Kouchner et Stéphane Lavignac
20/09/2018
« A la recherche des neutrinos » un livre de A. Kouchner et Stéphane Lavignac
Stéphane Lavignac (IPhT) vient de publier avec Antoine Kouchner, directeur du laboratoire Astroparticule et Cosmologie de l’Université Paris-Diderot, un livre de vulgarisation sur les neutrinos : « A la recherche des neutrinos – messagers de l’infiniment grand et de l’infiniment petit », collection « Quai des Sciences », éditions Dunod. Dépourvus de charge électrique, dotés de masses très petites et interagissant très faiblement avec la matière, les neutrinos comptent parmi les particules élémentaires les plus mystérieuses. Introduits presque en catimini par Wolfgang Pauli en 1930, dans une tentative désespérée de sauver le principe de conservation de l’énergie, les neutrinos n’ont eu de cesse d’intriguer les physiciens.
More

Beyond Amplitudes’ Positivity and the Fate of Massive Gravity
17/05/2018
Beyond Amplitudes’ Positivity and the Fate of Massive Gravity
The idea that physics at low energy, i.e. large distances, can be described in terms of light degrees of freedom alone is one of the most satisfactory organizing principle in physics, which goes under the name of Effective Field Theory (EFT). The effect of short-distance ultraviolet (UV) dynamics is systematically accounted for in the resulting infrared (IR) EFT by integrating out the heavy degrees of freedom, which generate an EFT built of infinitely many local operators. Yet, EFT’s are predictive even when the UV dynamics is unknown, because in practice only a finite number of operators contributes, at a given accuracy, to observable quantities. The higher the operator dimension, the smaller the effect at low energy. Remarkably enough, extra information about the UV can always be extracted if the underlying Lorentz invariant microscopic theory is unitary, causal and local.
More

L’universalité des matrices aléatoires: un article de Bertrand Eynard dans Pour la science
16/05/2018
L’universalité des matrices aléatoires: un article de Bertrand Eynard dans Pour la science
"L'énigme des matrices aléatoires", un article paru dans Pour la Science (mai 2018) sur les Matrices Aléatoires, par Bertrand Eynard, physicien à l'IPhT. Bertrand est depuis de nombreuses années un spécialiste des matrices aléatoires, sujet qu'il a enseigné à plusieurs reprises, en master et dans des Ecoles Doctorales, comme celle des Houches.  Les lois des matrices aléatoires sont des lois statistiques universelles que l'on retrouve partout : que ce soit dans les temps d'attente des bus et des métros, les voitures garées le long d'un trottoir, les arbres d'une forêt, les neurones, la bourse, les antennes de téléphonie mobile, mais aussi les résonances des noyaux atomiques, la théorie des cordes, la chromodynamique quantique, et même les  nombres premiers...
More

Nick Warner awarded an ERC Advanced grant to work at IPhT
10/04/2018
Nick Warner awarded an ERC Advanced grant to work at IPhT
Nicholas Warner, Professor of Physics, Astronomy and Mathematics at USC, has just been awarded an ERC Advanced grant to work at IPhT for the duration of this fellowship. Already a visitor and regular collaborator of IPhT, Nick will arrive January 2019 to work on his program "QBH Structure: The Quantum Structure of Black Holes and the Recovery of Information" with IPhT researchers. He will bring his creativity, his energy and his enthusiasm to the CEA and the whole theoreticians community on this fundamental and fast growing subject, at the interface between fundamental interactions, cosmology and quantum information! Congratulations and welcome, Nick!

10/04/2018
"Morphogenesis of Spatial Networks": a book by Marc Barthelemy
"Provides the first comprehensive presentation of state-of-the-art knowledge about spatial networks" This book develops a morphodynamical approach of spatial networks with a particular emphasis on infrastructure networks such as streets, roads and transportation networks (subway, train). The author presents the mathematical tools needed to characterize these structures and how they evolve in time. The book discusses the most important empirical results and stylized facts, and will present the most important models of spatial networks. The target audience primarily comprises research scientists interested in this rapidly evolving and highly interdisciplinary field, but the book may also be beneficial for graduate students interested in large networks.

03/01/2018
"Deconstructing the string landscape": A new ERC consolidator grant for Mariana Graña !
Mariana Graña of IPhT has been awarded an ERC consolidator grant for her project "Deconstructing the string landscape". Congratulations Mariana ! Despite its uniqueness, string theory has a “landscape” of effective partly phenomenological low-energy solutions with very different observable physics. The objective of her project is to "deconstruct" this landscape, and determine what parts of it can be promoted to consistent full-fledged string theory solutions, and what parts are inconsistent. It aims at understanding if the present geometrical landscape paradigm can be put on solid ground, or if more inventive alternatives such as “non-geometric landscape” have to be searched.

Do LIGO/VIRGO experiments put constraints on dark energy ?
03/01/2018
Do LIGO/VIRGO experiments put constraints on dark energy ?
The recent observation of gravitational waves from a neutron star binary inspiral by LIGO/Virgo and its electromagnetic counterpart in the form of a gamma-ray burst implies that gravitational waves travel at the speed of light, with deviations smaller than a part over million billions. Two Letters, one by Filippo Vernizzi (IPhT) and the other by Miguel Zumalaccaregui (currently MSCA fellow at BCCP Berkeley and IPhT), recently published in Physical Review Letters and chosen for the Editors' Suggestion, show dramatic consequences of this experimental result for models of dark energy and modified gravity. In some of these theories, dark energy acts as a refractive media for the propagation of gravity and a large class of them is ruled by this observation. The papers explore the implications for many known models and present the most general scalar-tensor theory leaving the speed of gravity unaffected.
More

Programme PSI2 DARKMOD at IPhT & IAS
08/08/2017
Programme PSI2 DARKMOD at IPhT & IAS
Dark Energy and Modified-Gravity cosmologies: DARKMOD   from September 11, 2017 to October 6, 2017 The acceleration of the expansion of the Universe at low redshifts has not received a satisfactory theoretical explanation yet. The value of a possible cosmological constant remains a puzzle and alternative approaches, dark energy or modified gravity, are still being developed. In view of the future observations by galaxy surveys, such as EUCLID for instance, it is timely to gather experts on both the theoretical aspects of dark energy and modified gravity, together with phenomenologists and observers. This 4-week workshop will provide an opportunity to discuss most aspects of both dark energy and modified gravity, from their theoretical construction to their link with observational cosmology. 

Boulder School 2017: Frustrated and Disordered Systems
03/07/2017
Boulder School 2017: Frustrated and Disordered Systems
Our colleague Lenka Zdeborová co-organizes the Boulder Summer School 2017 on Frustrated and Disordered Systems, July 3-28, 2017. Giulio Biroli is one of the keynote invited lecturers. On of the main goals of this event is to bring to a broader physics audience the advanced mean-field methodology developed (in considerable part in IPhT) in the physics of disordered systems, such as the replica and cavity methods. Modern applications of these methods in soft-matter physics, jamming, but also computer science and biology will be also exposed.

Large deviations of a tracer in the symmetric exclusion process
20/04/2017
Large deviations of a tracer in the symmetric exclusion process
A particle in a one-dimensional channel with excluded volume interaction displays anomalous single-file diffusion with fluctuations scaling as t^(1/4) in the long time limit. This phenomenon has been demonstrated in various experiments involving different types of physical systems such as zeolites, capillary pores, carbon nanotubes or colloids. On a one dimensional lattice, the Symmetric Exclusion Process, particles performing symmetric random walks and interacting by hard-core exclusion, is a pristine model of a single-file diffusion, amenable to quantitative analysis (Spitzer, 1970). At equilibrium, the variance of the position of a tagged particle has been calculated exactly by Arratia in 1983, and this result has been discussed since then in numerous theoretical papers, at various levels of physical intuition or mathematical rigor. However, the full distribution of a tagged particle and its higher cumulants (prone to experimental measurements) are not known. A rigorous work by S.
More

Langevin Prize for François Gélis
04/11/2016
Langevin Prize for François Gélis
  The French Physical Society has attributed the 2015´ Paul Langevin prize to François Gelis, for his work on quantum field theory in the strong field regime, and its applications to the non-equilibrium evolution of a quark-gluon plasma. Congratulations to him for wonderful work !  

Duncan Haldane, Nobel laureate in Physics in 2016, was a visitor at IPhT
13/10/2016
Duncan Haldane, Nobel laureate in Physics in 2016, was a visitor at IPhT
David Thouless, Duncan Haldane and Michael Kosterlitz have been awarded the Nobel Prize in Physics 2016 for their works on topological effects in condensed matter physics. Duncan Haldane is well-known in France. He spent four years at the Institute Laue-Langevin in Grenoble, from 1977 to 1981. During a visit to the IPhT in the early 1990s, he exposed some remarkable degeneracies of the spin chain which bears his name. This was the starting point of a collaboration with Denis Bernard, Michel Gaudin and Vincent Pasquier. To know more, please see the attached file : Haldane-en (pdf)

Does order exist in glasses ?
14/06/2016
Does order exist in glasses ?
Glasses are ubiquitous in daily life and technology. However, the microscopic mechanisms generating this state of matter remain subject to debate: Glasses are considered either as merely hyperviscous liquids or as resulting from a genuine thermodynamic phase transition toward a rigid state. A team of theoreticians and experimentalists, including Giulio Biroli from IPhT, have devised an experiment based on new theoretical ideas to provide a smoking-gun answer to this long-standing controversy. Performing the corresponding high-precision nonlinear dielectric experiments for supercooled glycerol and propylene carbonate, they find strong support for theories based on thermodynamic amorphous order. Moreover, when lowering temperature, they find that the growing transient domains are compact; that is, their fractal dimension df = 3.
More

New book «Counting Surfaces» by Bertrand Eynard
10/05/2016
New book «Counting Surfaces» by Bertrand Eynard
The book "Counting Surfaces" by Bertrand Eynard just appeared in the collection "Progress in Mathematical Physics" by Birkhäuser. In 2015 Bertrand Eynard was the recipient of  the Chaire André Aisenstadt at CRM Montréal and gave courses to present his recent results. This book is published in connection with these courses. It presents the general theory of the enumeration of maps, of the counting of Riemann surfaces, its combinatorics, geometrical and topological aspects, and its connection with physics and mathematics (string theory, random matrix theory, algebraic geometry, integrable systems, topological recursion). This book is self contained and aims at graduate students as well as advanced researchers. It should hopefully  become quickly a classic!

21st  Claude Itzykson Conference
06/05/2016
21st Claude Itzykson Conference "Dynamics, Disorder and Localization in Strongly Interacting Quantum Many Body Systems”
The 21st edition of this conference will take place on June 13-15 at IPhT.  It will be devoted to the themes of Dynamics, disorder and localization in strongly interacting quantum many body systems.  It is organized by Giulio Biroli, Eugene Bogomolny, Cecile Monthus and Marco Schiro, with the help of Sylvie Zaffanella, Anne Angles, Laure Sauboy (secretary). For registration, list of speakers, program and practical info, see the web site ot the conference.

Catherine Pépin is awarded an Advanced Grant from the European Research Council
14/04/2016
Catherine Pépin is awarded an Advanced Grant from the European Research Council
Catherine Pépin, permanent physicist at IPhT, has just been awarded a prestigious Advanced Grant from the European Research Council. This grant will enable her tu pursue, during five years, the exploration of charge orders and the SU(2) symmetry for understanding the phase diagram of cuprate superconductors. Congratulations to Catherine ! 

A Field Theory for String Theories ?
18/03/2016
A Field Theory for String Theories ?
Since strings are one-dimensional objects, they have richer dynamics than point particles. There are many indications that this richness can be captured by a "double field theory", which is a field theory in a double-dimensional space. One of the stringy features that suggests this are winding states:  modes where strings have a quantized wrapping number around compact cycles of the space, the simplest yet rich case being that of a circle. Winding modes have a mass proportional to the radius of the circle, while momentum states have a mass proportional to the inverse of the radius. There is a symmetry (T-duality) that interchanges these states while inverting the size of the circle. These two modes are nothing else than the harmonics of the doubled space. However, in order to make the double field theory consistent, a constraint is imposed, such that fields are independent of the T-dual coordinates, and no winding modes are allowed.
More

Prochaine conférence Cyclope donnée par Chiara Caprini, de l'IPhT, et Isabelle Grenier de l'Irfu le mardi 29 mars 2016 à 20h : Ondes gravitationnelles, les frémissements de l'espace-temps
11/03/2016
Prochaine conférence Cyclope donnée par Chiara Caprini, de l'IPhT, et Isabelle Grenier de l'Irfu le mardi 29 mars 2016 à 20h : Ondes gravitationnelles, les frémissements de l'espace-temps
L’Unité communication du CEA Saclay a le plaisir de vous convier à sa prochaine conférence CYCLOPE. Pour rappel, ces conférences de vulgarisation scientifique, destinées à tous publics, sont gratuites et ont lieu sur le plateau de Saclay, à l’INSTN. Vous trouverez toutes les informations utiles dans l’invitation en pièce jointe.

From theoretical physics to artificial intelligence
13/01/2016
From theoretical physics to artificial intelligence
The daily financial newspaper Les Echos devotes an article to a former PhD student of IPhT, Ekaterina Retinskaya-Besse, who joined the startup Dreamquark after her PhD (2014) and then founded Dreamup Vision which applies deep learning techniques to retina analysis. Congratulations Katya!  

Devil staircases in dimer models
06/01/2016
Devil staircases in dimer models
Dimer models appear in different fields of statistical physics (Ising models), in the theory of correlated electron systems (antiferromagnetic insulators and topological phases of matter), field theory (compactified free field) and combinatorics (partitions and "Aztec diamonds"). These models are built from arrangements of "rods" (dimers) that occupy the bonds of a lattice, and which satisfy a hard-core constrain: each lattice site must touch the end of one and only one dimer. In the quantum versions of these models, the dimers have the possibility to move on the lattice (hopping terms in the hamiltonian), and this leads to some rich quantum many-body models, but which study is in general difficult. In a recent work [1], some theoreticians (IPhT, Paris-Sud University and P. et M.
More

 Conference
03/07/2015
Conference "de Sitter and microstate lansdscapes in string theory"
The conference "de Sitter and microstate lansdscapes in string theory" took place at IPhT from June 16 to 19, 2015. This workshop gathered 70 participants from around the world to discuss recent advances in understanding the landscapes of de Sitter spaces in string theory on one hand, and of black hole microstate geometries on the other. Both landscapes have experienced quite intense recent remodeling: on the black hole side this was driven by “fuzzball/firewall” information-theory-based arguments that black hole solutions are only thermodynamic approximations that stop describing the physics at the scale of the horizon, where they should be replaced by horizonless geometries dual to the black hole microstates, and on the cosmology side by the realization that antibranes, which are one of the key ingredients needed to obtain a landscape of de Sitter vacua, may give rise to instabilities. 

Romain Vasseur receives a PhD Prize from the
23/06/2015
Romain Vasseur receives a PhD Prize from the "Triangle de la Physique"
Romain Vasseur, former graduate student at IPhT, has been awarded a 2015 PhD prize from the "Triangle de la Physique", in the category "Theory". Romain's PhD thesis, co-directed by Hubert Saleur (IPhT) and Jesper Jacobsen (LPTENS), is dealing with nonunitary Conformal Field Theories and various applications in condensed matter physics and geometrical models of statistical mechanics. Romain is now postdoc at UC Berkeley. Congratulations Romain!

Hubert Saleur receives an ERC Advanced Grant
23/06/2015
Hubert Saleur receives an ERC Advanced Grant
Hubert Saleur, permanent physicist at IPhT, has just been awarded a prestigious Advanced Grant from the European Research Council. This grant will allow him to develop, during the 5 next years, his research project on the "plateau transition" in the Quantum Hall Effect, a famous unsolved problem in condensed matter physics. In this direction, he also aims at studying and classifying Nonunitary Conformal Field Theories.   Congratulations Hubert!

Anomalous diffusion and fluctuations of a tracer particle
19/06/2015
Anomalous diffusion and fluctuations of a tracer particle
Single-file diffusion is referred to the motion of many interacting particles in one-dimensional channel which are so narrow that the particles can not pass each other, and as a result their sequence is preserved over time. Since its introduction more than 50 years ago, in modelling ion transport through cell membranes, the single-file diffusion has been observed in a wide variety of systems, e.g. diffusion of large molecules in zeolites, carrier migration in super ionic conductors, sliding of proteins along DNA, and many more.The characteristic feature of single-file diffusion is that, the variance of the displacement of a tracer particle at a time much larger than the mean collision time, scales as the square-root of time, compared to the linear dependence in normal diffusion. This sub-diffusive scaling has been demonstrated in a number of experimental realization.
More

Bending of Light in Quantum Gravity
08/04/2015
Bending of Light in Quantum Gravity
A century ago Albert Einstein used his new theory of gravity – the general relativity - for evaluating the bending angle of rays of light under the gravitational pull from the Sun. Ludovic Planté, Pierre Vanhove and their colleagues have evaluated for the first time the quantum gravity correction to this bending angle. The computation is done in the framework of the low-energy effective field theory, which allows evaluating large distance effects by keeping only low energy fields and couplings. This contribution is universal to any theory of quantum because since it is independent of (any unknown) high-energy degrees of freedom. The quantum correction depends on the spin of the deflected massless particle, in contrast to the classical contribution. Therefore it violates the equivalence principle but preserves the fundamental symmetries of the theory on which Einstein based his theory of general relativity. "Bending of Light in Quantum Gravity", N. E. J.
More

RNA: The unknotted strands of life
08/04/2015
RNA: The unknotted strands of life
No one had checked before, but RNA, the nucleic acid involved in many cell functions including protein synthesis, appears to be the only « strand of life » not to have knots. Over the years, advances in structural biology have firmly established that both proteins and DNA, although subject to evolutionary selection, do not escape the statistical law whereby a sufficiently long and compacted molecular strand will inevitably be entangled. However, no one to date had looked into the case of RNA. Using the structural description provided for approximately 6,000 RNA chains entered in the Protein Data Bank, a team of researchers from the SISSA (Italy) and the IPhT has performed a thorough study of the presence of knots in these biopolymers.
More

Liouville Quantum Gravity on the Riemann Sphere
24/02/2015
Liouville Quantum Gravity on the Riemann Sphere
In 1981, the famous theoretician A. Polyakov introduced the quantum Liouville theory as a model for the quantized string. This theory “quantizes” the Liouville equation R=-1 of classical geometry, which characterizes Riemann surfaces with negative curvature. It is thus a quantum theory of gravity, where the geometry of a two dimensional space-time in quantized (1 time dimension + 1 space dimension). Liouville theory has remarkable properties. It is a conformal theory (it is endowed with an infinite symmetry group, the same as for string theories and critical systems such as the Ising model in two dimensions). Liouville theory appears, sometimes unexpectedly, in many problems of theoretical physics and of pure mathematics. It has been therefore very much studied via the methods of Conformal Field Theory and of Integrable Systems.
More

A new, yet faster, version of FastJet
03/02/2015
A new, yet faster, version of FastJet
Quarks and gluons are abundantly produced in the final state of the LHC collisions. They are observed as collimated showers of particles, known as jets. Jets are crucial objects in particle physics, used e.g. in about 60% of the LHC analyses.  In practice, jets need to be reconstructed from the particles in the final state using a jet algorithm (the anti-kt algorithm [1] at the LHC). This, as well as all sorts of manipulations on jets --- e.g. calculating their area, subtracting soft contamination or studying their internal (sub)structure --- is done numerically. FastJet [2], developed by Matteo Cacciari, Gavin Salam and Gregory Soyez, is the computer interface used by the high-energy community to perform this fundamental task.  With hundreds of events recorded every second at the LHC, time is of the essence.
More

Uncovering the spatial structure of mobility networks
28/01/2015
Uncovering the spatial structure of mobility networks
The extraction of a clear and simple footprint of the structure of large, weighted and directed networks is a general problem that has many applications. An important example is given by origin-destination matrices, which contain the complete information on commuting flows, but are difficult to analyze and compare. Marc Barthelemy, and Thomas Louail, together with their collaborators proposed a versatile method [1], which extracts a coarse-grained signature of mobility networks, under the form of a 2x2 matrix that separates the flows into four categories. They applied this method to origin-destination matrices extracted from mobile phone data recorded in 31 Spanish cities and showed that these cities essentially differ by their proportion of two types of flows: integrated (between residential and employment hotspots) and random flows, whose importance increases with city size.
More

Spin Vertex and 3 Point Function in AdS/CFT Correspondence
09/01/2015
Spin Vertex and 3 Point Function in AdS/CFT Correspondence
The gauge/string duality is a half-century old idea, which appeared as an attempt to give an adequate description of strongly correlated quantum field theories, such as QCD. The best studied example of such a duality, known by the name AdS/CFT, is the relation between the maximally supersymmetric multi-color Yang-Mills theory in four dimensions, the conformal invariant  “super-QCD”, and a super-string theory in a ten-dimensional curved space, composed of a 5-dimensional anti-de Sitter (AdS) space and a 5-dimensional sphere. The dramatic progress of our understanding of AdS/CFT achieved in the last decade was triggered by the discovery that both sides of the correspondence possess the same integrable structure of the type usually associated with two-dimensional systems, as the Heisenberg XXX ferromagnet. AdS/CFT gives the first example of a non-trivial 4-dimensional integrable theory.
More

Hélène Dupuy receives a
08/12/2014
Hélène Dupuy receives a "L'Oréal - UNESCO for women in science" fellowship
Hélène Dupuy, 3d year graduate student in cosmology at IPhT, under the supervision of Francis Bernardeau, was awarded a L'Oréal - UNESCO "For women in Science" fellowship 2014. Every year, these fellowships are awarded in France to 10 outstanding graduate students, from all scientific domains, in order to support their research activities, as well as encourage outreach actions. Our warm congratulations to Hélène!

Roger Balian and François David interviewed on quantum physics
25/11/2014
Roger Balian and François David interviewed on quantum physics
In December 2013, we interviewed two of our eminent scientists, Roger Balian and François David, about the foundations of quantum mechanics.  We have used the 17 questions ( educed to 15) of Maximilian Schlosshauer in his book "Elegance and Enigma: The Quantum Interviews" in order to set up a context in which to ask the questions.  The result is a movie that you can watch on this site or on YouTube. Enjoy the show ! https://www.youtube.com/watch?v=-K_8W9lnSp8 For more information: Understanding quantum measurement from the solution of dynamical models, A. Allahverdyan, R. Balian, T. Nieuwenhuizen, Physics Reports 252 (2013) p. 1-166 The Formalisms of Quantum Mechanics, an introduction, F. David, Lecture Notes in Physics Vol. 893 (Springer 2015)

Robi Peschanski on air on France Culture
25/11/2014
Robi Peschanski on air on France Culture
Our Colleague and friend Robi Peschanski was interviewed last Saturday on the radio station France Culture as part of the series of “Scientific conversations” held each Saturday by Etienne Klein. Robi answered the question “In theory, what are looking for?” in this 45 minute long programme during which he has recalled snippets from his personal life and presented some of the  major landmarks of particle physics from the 1960’s to the present time.  You can download the interview following the link: http://www.franceculture.fr/emission-la-conversation-scientifique

Marco Cirelli awarded the Thibaud Prize of the académie de Lyon
25/11/2014
Marco Cirelli awarded the Thibaud Prize of the académie de Lyon
Marco Cirelli has been awarded the Thibaud Prize given by the “académie des sciences, belles lettres et arts” of Lyon (France) for his work on Dark Matter and its indirect detection. This prize is attributed to a physicist, aged between 30 and 40, for his/her significant contributions to nuclear physics, particle physics or their applications to astrophysics. The ceremony will take place in Lyon on  the 16th of December. We warmly congratulate Marco for this award!

The CRM invites Bertrand Eynard on an Aisenstadt Chair
16/07/2014
The CRM invites Bertrand Eynard on an Aisenstadt Chair
Bertrand Eynard has been nominated by the Centre de Recherches Mathématiques (CRM) in Montreal on an Aisenstadt Chair, for the second semester 2015, related with the thematic semester devoted to the topics AdS/CFT, Holography, Integrability. This Chair will give him the opportunity to give a series of lectures on his work, and  to write a monography, jointly published by the CRM and the American Mathematical Society. Since their creation in the 1970', the Aisenstadt Chairs have welcome the the CRM the most prestigious mathematicians. Bertrand has been a permanent member of IPhT since 1995. He has worked on the theory of random matrix models. Together with his former student Nicolas Orantin, he has developed the method of "topological recurrence", which has since then spread into various domains of mathematics (knot theory, geometry of Riemann surfaces, algebraic geometry) and theoretical physics (integrable systems, topologocal string theory..).
More

The CNRS Médaille de Bronze awarded to Lenka Zdeborova
21/03/2014
The CNRS Médaille de Bronze awarded to Lenka Zdeborova
Lenka Zdeborova is the recipient of the CNRS "médaille de bronze" 2014 Congratulations! Chargé de Recherche at CNRS and member of IPhT since 2010, Lenka is a specialist  of the statistical physics of complex systems and its applications in computer science and technology.  The CNRS "médaille de bronze" is awarded in each scientific section of CNRS once a year to an exceptional young researcher.

A de Sitter landscape?
18/12/2013
A de Sitter landscape?
String Theory has a “landscape” of solutions (space-time vacua) with negative cosmological constant (anti-de Sitter spaces) while fairly recent observations tell us that our universe undergoes an accelerated expansion, hence has a positive cosmological constant, corresponding to a de Sitter space. Obtaining such de Sitter spaces remains one of the major open problems in string theory. The most generic proposal starts from any solution in the landscape of anti-de Sitter vacua, and argues that one can transform it into a long-lived metastable de Sitter space by placing appropriate branes (extended dynamical objects that generalizes particle and strings). This mechanism gives rise to a huge landscape of string theory de Sitter vacua. I. Bena, M. Graña and collaborators at IPhT have shown that taking into account the dynamics of the branes always makes the solution singular, which invalidates the whole mechanism.
More

IPhT Activity Report 2008-2013
11/12/2013
IPhT Activity Report 2008-2013
The activity report of IPhT, over the period January 2008 - June 2013, is now accessible online.

First consistent code to compute intrinsic non-Gaussian features in the cosmic microwave background
06/12/2013
First consistent code to compute intrinsic non-Gaussian features in the cosmic microwave background
Zhiqi Huang and Filippo Vernizzi have developed at IPhT the first consistent numerical code to compute second-order effects in the cosmological perturbations and, in particular, the intrinsic non-Gaussian features expected in the cosmic microwave background temperature anisotropies.    The cosmic microwave background is Gaussian to very high accuracy but there may be tiny deviations from a pure Gaussian distribution, that are remnants of certain models of the early universe. For this reason, one of the primary goals of the Planck satellite mission was to measure these deviations. Nevertheless, the signal coming from the early universe is always biased by non-linearities due to gravity and fluid dynamics, which must be fully understood to correctly interpreting the data.    The numerical code developed at IPhT completely characterizes these nonlinearities and allows to filter out the primordial signal.
More

Super Yang-Mills, N=4, Integrability and Tests of the AdS/CFT Correspondence
04/11/2013
Super Yang-Mills, N=4, Integrability and Tests of the AdS/CFT Correspondence
The supersymmetric gauge theory with maximal supersymmetry (SYM N=4) in four dimensions is a non-trivial quantum field theory which shares some of its main features with Quantum Chromo-Dynamics (QCD), the theory of strong interactions. Although QCD is only approximately scale invariant at high energy, the maximally supersymmetric theory is exactly scale invariant and endowed with an even larger symmetry: conformal invariance. Moreover, according to Maldacena’s conjecture of 1997, this theory is strictly equivalent to string theory on a space-time with neagtive curvature (the AdS5xS5 background). Moreover, in the ‘t Hooft  planar limit where the number of quark colours becomes infinite, the theory becomes integrable with an infinite of non-local conserved charges. For all these reasons, the maximally supersymmetric Yang-Mills theory has been a very active subject in theoretical physics for the last decade.
More

11/10/2013
"Journal of Physics A" : Best Paper Prize 2013
Since 2009, Journal of Physics A has awarded a Best Paper Prize, which serves to celebrate and applaud well written papers that make a significant contribution to their field. Among the winners for this year's Best Paper Prize are Gaëtan Borot (then on leave from IPhT, presently at MPI, Bonn) and Céline Nadal (Oxford) for their article  "Purity distribution for generalized random Bures mixed states".  

David Kosower receives the J. J. Sakurai Prize for Theoretical Particle Physics 2014
02/10/2013
David Kosower receives the J. J. Sakurai Prize for Theoretical Particle Physics 2014
David Kosower was awarded the J. J. Sakurai Prize for Theoretical Particle Physics 2014, jointly with his collaborators Zvi Bern and Lance Dixon, "for pathbreaking contributions to the calculation of perturbative scattering amplitudes, which led to a deeper understanding of quantum field theory and to powerful new tools for computing QCD processes." The J. J. Sakurai Prize for Theoretical Particle Physics is awarded each year by the American Physical Society, to recognize and encourage outstanding achievement in particle theory. Congratulations!

Medaile Akademie věd ČR udělené v roce 2013 Rogeru BALIANOVI
23/09/2013
Medaile Akademie věd ČR udělené v roce 2013 Rogeru BALIANOVI
Předseda Akademie věd ČR udělil v roce 2013 tyto medaile:   Čestnou medaili AV ČR „De scientia et humanitate optime meritis“   prof. Rogeru BALIANOVI, z Institut de Physique Théorique, Saclay, France  

 The Mergier Bourdeix Prize is awarded to Pierre Vanhove
26/07/2013
The Mergier Bourdeix Prize is awarded to Pierre Vanhove
The 2013 Mergier Bourdeix Prize has been jointly awarded to Sylvia Serfaty, Professor of Mathematics at the Université Pierre et Marie Curie, Paris, and to Pierre Vanhove, Physicist at IPhT, CEA Saclay. The Mergier Bourdeix Prize is one of the Grands Prix de l'Académie des Sciences: "It is awarded every year to a young French researcher working on fundamental scientific problems not directed towards immediate applications, and whose results reveal an exceptional talent. Pierre Vanhove mostly works on string theory.

A new algorithm for discrete tomography
02/05/2013
A new algorithm for discrete tomography
X-ray tomography is a widely used imaging technique that allows one to produce internal images in materials science or medical applications. An X-ray beam is transmitted through the sample and the projection is recorded on a detector at different angles. The most widely used reconstruction algorithm of the original image from these measurements provides satisfying results only for a large number of such projections. In order to reduce the acquisition time or the total dose absorbed by the patient, tomography users need other reconstruction algorithms that incorporate known properties of the original image. In particular, images with a discrete set of absorption values and few interfaces are frequently encountered in materials science. Inspired by results from statistical physics of the Ising model, Lenka Zdeborova and her colleagues [1] have proposed a novel message-passing algorithm for discrete tomography.
More

Scaling laws for products of random matrices
11/04/2013
Scaling laws for products of random matrices
Matrix products provide a natural tool to investigate one-dimensional systems consisting of many units in series, as soon as every unit can be described by means of a transfer matrix. Disordered systems usually yield products of independent random matrices which do not commute among themselves. Many situations of interest are already described by the simplest non-trivial case of 2 times 2 matrices. Typical examples include the Anderson problem of an electron propagating in a random potential, and classical and quantum Ising spin chains with random fields and/or exchange couplings. Furthermore, the most relevant quantities (localization length, density of states, free energy, ground-state energy) can be expressed in terms of the Lyapunov exponent characterizing the exponential growth of the matrix product with the number of factors.
More

Spin Imbalance and Spin-Charge Separation in a Mesoscopic Superconductor
29/03/2013
Spin Imbalance and Spin-Charge Separation in a Mesoscopic Superconductor
What happens to spin-polarised electrons when they enter a superconductor ? Superconductors at equilibrium and at finite temperature contain both paired particles (of opposite spin) in the condensate phase as well as unpaired, spin-randomised quasiparticles. Injecting spin-polarised electrons into a superconductor thus creates both spin and charge imbalances. These must relax when the injection stops, but not necessarily over the same timescale. These different relaxation times can be probed by creating a dynamic equilibrium between continuous injection and relaxation, which leads to constant-in-time spin and charge imbalances. These scale with their respective relaxation times and with the injection current. Spin-charge separation effects could occur e.g. if the spin relaxation time is longer than the charge relaxation time. In a recent article published in Nature Physics [1], C. Bena et al. present evidence for an almost-chargeless spin imbalance in a mesoscopic superconductor.
More

Cookbook for Dark Matter Indirect Detection
07/03/2013
Cookbook for Dark Matter Indirect Detection
Marco Cirelli and his collaborators (mostly based at CERN, in Estonia and in Italy) had published back in 2010 a complete set of numerical products for Dark Matter Indirect Detection. This work is increasingly used by the community and it is becoming, for some aspects, the state-of-the-art set of tools for this domain. Since several decades, cosmological and astrophysical evidence accumulate on the existence of Dark Matter (DM), thanks to its gravitational influence at different scales, showing that it constitutes 80% of the matter in the Universe. On the other hand, an explicit (non- gravitational) manifestation of DM is yet to be identified as its nature is as elusive as ever. One of the most promising approaches to solve this mystery is Indirect Detection, which aims to unravel the possible excess in cosmic rays produced by the annihilations or decay of DM particles in the Galaxy or beyond.
More

Roger Balian is 80!
18/01/2013
Roger Balian is 80!
One of the founders of the Service de Physique Théorique de Saclay in the early sixties, Roger Balian is still one of its most eminent members. Head of the SPhT from 1979 to 1987, member of the French Académie des Sciences, former student and Professor at Ecole Polytechnique, former Director of the Les Houches Physics School, he authored well known teaching books. Roger is famous for the Balian-Low theorem, the Balian-Bloch semiclassical expansions, the discovery of the B-Phase of superfluid He3, his works in nuclear physics and the N-body problem, on the Casimir effect, on irreversibility and entropy in statistical mechanics, etc. As active as ever, Roger is presently interested in the measurement process in quantum mechanics. Happy birthday Roger!

Apprivoiser les statistiques hors d'équilibre
12/11/2012
Apprivoiser les statistiques hors d'équilibre
Alexandre Lazarescu, Kirone Mallick et leurs collaborateurs  ont publié dans Physical Review Letters une  caractérisation analytique de la statistique du courant dans un modèle simplifié de transport classique (le processus d'exclusion asymétrique) loin  de l’équilibre thermodynamique. Ce résultat  constitue un véritable tour de force mathématique dans un domaine où les solutions exactes sont rares. Le processus d'exclusion,  étudié  depuis plus de 40 ans dans des disciplines scientifiques variées (théorie des probabilités, physique statistique, biophysique) propose un cadre d’étude précis des relations entre les descriptions microscopique et macroscopique d'un système non-thermodynamique.
More

04/09/2012
"Journal of Physics A" : Best Paper Prize 2012
Since 2009, Journal of Physics A has awarded a Best Paper Prize, which serves to celebrate and applaud well written papers that make a significant contribution to their field. Among the winners for this year's Best Paper Prize are Kirone Mallick et Alexandre Lazarescu for their article  "An exact formula for the statistics of the current in the TASEP with open boundaries".  

Great success for the 17th annual meeting Itzykson!
05/07/2012
Great success for the 17th annual meeting Itzykson!
The 17th edition of the Itzykson meeting took place in IPhT on June 18-20 2012, and was devoted to dark energy and modified gravity. This is a topical subject in cosmology nowadays, as testified by the 2011 Nobel prize in physics which has been awarded to the discovery of the acceleration of the universe Displays meetings Twenty-six speakers coming from all over the world have presented the most recent advancement in dark energy and modified gravity both from the observational and the theoretical point of view: on one side, the forthcoming observational dark energy surveys have been presented, such as Euclid and Wiggle-Z, which will allow an extremely precise measurement of the properties of cosmic acceleration; on the other side, the latest theoretical proposals for modifying gravity have been debated, such as massive gravity, chameleons and galileons theories.
More

Permanent Position in Theoretical Physics
29/03/2012
Permanent Position in Theoretical Physics
The IPhT invites applications for a permanent research position in Particle physics beyond the Standard Model at the advanced junior to senior faculty level. More informations can be found on http://ipht.cea.fr/en/Phocea-SPhT/ast_visu_spht.php?id_ast=643

17th Itzykson meeting
20/03/2012
17th Itzykson meeting
This year the 17th Itzykson meeting will be devoted to Dark Energy and Modified Gravity. It will be held in the amphi Bloch on June 18-20. You are all invited to participate. If you plan to attend the full three days, please register on the website. This will help us to keep track of the total number of participants. Thank you!   We hope to see you there, Philippe, Chiara and Filippo

12/12/2011
"Nuclear Physics B" award
Gregory Korchemsky has received an award from the journal "Nuclear Physics B" for his 2008 paper entitled "Conformal properties of four-gluon planar amplitudes and Wilson loops", which is one the most cited article in this journal for the period 2006-2010.   NPB_topcited_Korchemsky.pdf (350 Ko)

ERC grant for
25/08/2011
ERC grant for "New Directions in Dark Matter Phenomenology at the TeV scale"
Marco Cirelli  has just obtained an ERC Starting Grant of 5 years for his project "New Directions in Dark Matter Phenomenology at the TeV scale". The NewDark project focuses on the phenomenology of Dark Matter, particles which constitute 80% of the matter in the Universe (as many astrophysical and cosmological observations now confirm) but have never been discovered directly. The next few years will bring a large amount of data (from cosmic ray observations, gamma ray telescopes, underground nuclear recoil experiments and the Large Hadron Collider at CERN) thoroughly exploring for the first time the TeV scale, where the Dark Matter particles are expected to hide. The project aims at making the most of these data, addressing the issue from different complementary directions by combining particle physics theory, cosmology and astrophysics. 

ERC grant for
24/08/2011
ERC grant for "Non Perturbative Renormalization Group Theory of Glassy Systems"
Giulio Biroli obtained an ERC Starting Grant of 5 years for his project “Non Perturbative Renormalization Group Theory of Glassy Systems”. Glassy systems are central in several fields from statistical mechanics and soft matter to material sciences and biophysics and they appear even in completely different areas of science such as information theory, computer science, agent-based models and game theory.  The aim of this ERC project is to develop a new, possibly groundbreaking, approach to glassy systems based on the non-perturbative renormalization group (NPRG) formalism. I will mainly focus on the problem of the glass transition and the physics of glass-forming liquids. It is likely that the progress we will make in this direction will also be instrumental also for other glassy systems such as spin glasses, quantum glasses and jamming systems.

13/07/2011
"Nuclear Physics B" award
Marco Cirelli has received an award from the journal "Nuclear Physics B" for his 2009 paper entitled "Model-independent implications of the e+, e-, anti-proton cosmic ray spectra on properties of Dark Matter", which is one the most cited article in this journal for the period 2006-2010.   prix-Cirelli.pdf (332 Ko)

Une bourse ERC pour étudier les systèmes quantiques fortement corrélés
13/07/2011
Une bourse ERC pour étudier les systèmes quantiques fortement corrélés
Olivier Parcollet a obtenu une bourse ERC Junior (Starting Grant) de 5 ans pour son projet "Quantitative approaches for strongly correlated quantum systems in equilibrium and far from equilibrium."

Médaille d'argent
20/05/2011
Médaille d'argent
  Hubert Saleur reçoit la médaille d'argent 2011 du CNRS.

LabEx
05/05/2011
LabEx
Les résultats de l'appel à projets Laboratoires d'Excellence (LabEx) ont été annoncés le 25 mars 2011. Voici les décisions concernant les trois LabEx dans lesquels l'IPhT était impliqué : - labex « FMJH » (Fondation mathématique Jacques Hadamard) : non accepté - labex « P2IO » (Physique des 2 Infinis et des Origines) : accepté - labex « PALM » (Physique,  Atomes, Lumière, Matière) : accepté

Attribution d’une chaire Blaise Pascal à Constantin Efetov sur l'IPhT
03/05/2011
Attribution d’une chaire Blaise Pascal à Constantin Efetov sur l'IPhT
Financées par l’Etat et le Conseil régional d’Ile-de-France, les chaires Blaise Pascal donnent à un laboratoire francilien la possibilité d’inviter un scientifique de haut niveau pour participer à ses programmes. Constantin Efetov vient renforcer le groupe de matière condensée de l'IPhT. Les chaires internationales de recherche Blaise Pascal ont été créées en 1996 par l'Etat et la Région d'Ile-de-France. Chaque chaire permet à un scientifique étranger de très haut niveau et de renommée internationale de poursuivre ses travaux dans un établissement d'enseignement supérieur ou de recherche de Paris/Ile-de-France pendant 12 mois éventuellement répartis sur 2 ans. Les dossiers sont initiés et portés par le laboratoire invitant.
More

16ème Conférence ITZYKSON
18/04/2011
16ème Conférence ITZYKSON
La 16ème conférence Itzykson sur le thème "Extremes and Records", organisée par C. Godrèche, S.N. Majumdar et G. Schehr, aura lieu du 14 au 17 juin 2011 à l'IPhT Saclay. Pour de plus amples renseignements, veuillez consulter le site : http://lptms.u-psud.fr/workshop/itzykson16/

Jean Zinn-Justin élu à l'Académie
22/03/2011
Jean Zinn-Justin élu à l'Académie
Jean Zinn-Justin vient d'être élu membre de l'Académie des Sciences. C'est une juste reconnaissance de ses contributions majeures à la physique, en particulier à la théorie des champs.  Je le félicite chaleureusement au nom de tout l'IPhT. Michel Bauer.

16/03/2011
"Gay Lussac/Humboldt" 2010 prize to Volker Schomerus
  We have learned that our former collegue Volker Schomerus, nominated by Hubert Saleur and Henri Orland, was awarded the Franco-German "Gay Lussac/Humboldt" 2010 prize. Volker Schomerus, is presently head of the theory group at the Deutsches Elektronen-Synchrotron DESY. Volker Schomerus was a permanent physicist at IPhT from 2002 to 2005 and is currently working in strings theory and quantum field theory.

Matt Luzum receives the Dissertation in Nuclear Physics Award from APS
04/11/2010
Matt Luzum receives the Dissertation in Nuclear Physics Award from APS
<p><a href="/Phocea/file.php?reload=1288867805&amp;class=newsImg&amp;file=_316_0_.jpg"><img style="border: 0; margin: 0 8px 5px 0;" src="/Phocea/file.php?reload=1288867805&amp;class=newsImg&amp;file=_316_0_.jpg" alt="img" width="120" align="left" /></a>Matthew Luzum has received the 2011 Dissertation in Nuclear Physics Award from the Division of Nuclear Physics of The American Physical Society for&nbsp;"pioneering developments in the theory of relativistic viscous hydrodynamics, in particular for the implementation of stable numerical simulations that have been used to quantify the low value of the shear viscosity coefficient observed in ultrarelativistic heavy ion collisions at RHIC, with important implications for the near-perfect fluidity of the quark-gluon plasma." <br /> Matt earned his PhD from the University of Washington (Seattle) in 2009.
More

Une bourse ERC Senior pour la QCD
23/10/2010
Une bourse ERC Senior pour la QCD
<a href="/Phocea/file.php?reload=1287841817&class=newsImg&amp;file=_313_0_.jpg"><img src="/Phocea/file.php?reload=1287841817&class=newsImg&amp;file=_313_0_.jpg" alt="img" style="border:0;margin:0 8px 5px 0;" align="left" width="120" /></a><p>&nbsp;</p> <p>Jean-Paul Blaizot vient d'obtenir une bourse ERC Senior.<br />Son projet s'intitule "Strongly coupled QCD matter" et durera 5 ans.<br /><br />Toutes les f&eacute;licitations de l'IPhT.</p>

Une bourse ERC pour etudier les nanotubes de carbone et le graphène
23/10/2010
Une bourse ERC pour etudier les nanotubes de carbone et le graphène
<p><a href="/Phocea/file.php?reload=1287841662&amp;class=newsImg&amp;file=_312_0_.jpg"><img style="border: 0; margin: 0 8px 5px 0;" src="/Phocea/file.php?reload=1287841662&amp;class=newsImg&amp;file=_312_0_.jpg" alt="img" width="120" align="left" /></a></p> <p>Cristina Bena a obtenu une bourse ERC Junior (Starting Grant) de 5 ans&nbsp;pour son projet "Understanding the Electronic Properties of Carbon&nbsp;Nanotubes and Graphene as Quantum Conductors".</p> <p><br />Cristina est enseignante-chercheuse &agrave; l'Universit&eacute; d'Orsay. &nbsp;Gr&acirc;ce &agrave; &nbsp;une chaire CEA - Universit&eacute;, l'IPhT peut l'accueillir &agrave; temps partiel.</p> <p>Avec toutes les f&eacute;licitations de l'IPhT.</p>

ERC grant for
17/09/2010
ERC grant for "The Low Energy Limit of String Theory and the Observable World"
It's official! Mariana Graña has obtained a 5 years "Starting Grant" of the European Research Council for her project "The Low Energy Limit of String Theory and the Observable World". Five other laureates for this third round of the ERC Starting Grant program are affiliated to the Direction des Sciences de la Matière. Congratulations to all !

CNRS
19/08/2010
CNRS
  Lenka Zdeborová just got a "Chargée de Recherche" permanent research position at CNRS and will be a member of our Institute.  Lenka is a specialist of the statistical physics of disordered systèmes, especially of combinatorial optimization. Lenka will renforce the group of statistical physics and condensed matter and we are very happy to welcome her at IPhT. H. Orland  

2010 Beg Rohu Summer School "Concepts and Methods of Statistical Mechanics"
14/01/2010
2010 Beg Rohu Summer School "Concepts and Methods of Statistical Mechanics"
<p><a href="/Phocea/file.php?reload=1263466896&amp;class=newsImg&amp;file=_252_0_.jpg"><img style="border:0;margin:0 8px 5px 0;" src="/Phocea/file.php?reload=1263466896&amp;class=newsImg&amp;file=_252_0_.jpg" alt="img" width="120" align="left" /></a>The 2010 Beg Rohu summer school of statistical physics and condensed matter "Concepts and Methods of Statistical Mechanics" will take place from the 23rd of August to the 4th of September 2010,&nbsp;at the French National Sailing School, on the peninsula of Quiberon in southern Brittany, France.</p> <p>Lectures:</p> <p>G. Biroli: Statistical Dynamics<br /> J.-S. Caux: Integrable Models in Atomic and Condensed Matter Physics<br /> B. Delamotte: Non-Perturbative Renormalization Group<br /> W.
More

PhD proposals at  IPhT in 2010
17/12/2009
PhD proposals at IPhT in 2010
<p><a href="/Phocea/file.php?reload=1261051945&amp;class=newsImg&amp;file=_250_0_.jpg"><img style="border:0;margin:0 8px 5px 0;" src="/Phocea/file.php?reload=1261051945&amp;class=newsImg&amp;file=_250_0_.jpg" alt="img" width="80" align="left" /></a>IPhT scientists propose PhD topics for 2010. Subjects include: string theory, QCD physics, statistical physics, out of equilibrium systems. For the list of topics, possible fundings and administrative information, <a href="/Phocea-SPhT/ast_visu_spht.php?id_ast=108">see here</a>.</p> <p>A presentation visit of the Institute is scheduled on the afternoon of the 12th of January, 2010.</p>

Prix de l'Académie des Sciences
27/11/2009
Prix de l'Académie des Sciences
Le Prix thématique de sciences physiques Ernest Déchelle est remis à Olivier PARCOLLET, chercheur à l’Institut de physique théorique du CEA à Saclay, pour ses travaux de recherche fondamentale dans le domaine de la physique théorique de la matière condensée. Ces travaux portent sur la compréhension des mécanismes liés à la supraconductivité à haute température critique. Le Prix Ernest Déchelle est attribué tous les quatre ans.

CNRS : affectation de Gregory Soyez à l'IPhT
19/08/2009
CNRS : affectation de Gregory Soyez à l'IPhT
<a href="/Phocea/file.php?reload=1261605909&class=newsImg&amp;file=_223_0_.jpg"><img src="/Phocea/file.php?reload=1261605909&class=newsImg&amp;file=_223_0_.jpg" alt="img" style="border:0;margin:0 8px 5px 0;" align="left" width="120" /></a><p> J'ai le plaisir de vous annoncer que Gregory Soyez, qui &eacute;tait candidat sur un poste CR2 &agrave; la commission 02 du CNRS, a &eacute;t&eacute; recrut&eacute; et affect&eacute; dans notre laboratoire. Gregory est un sp&eacute;cialiste de QCD (physique des jets). Beaucoup d'entre nous le connaissent d&eacute;j&agrave;, puisqu'il a &eacute;t&eacute; post-doc dans notre labo avant de partir &agrave; Brookhaven. Il a travaill&eacute; en particulier avec Robi, Edmond et Francois G. Nous lui souhaitons la bienvenue &agrave; l'IPhT.</p>

L'espace et le temps
04/08/2009
L'espace et le temps
L'article "L'espace et le temps", paru dans ScintillationS, n°79 - Juin 2009, par Chiara CAPRINI. Espace-Temps.pdf (1.9 Mo)

Quantum fields in extreme environments
31/03/2009
Quantum fields in extreme environments
A workshop to celebrate the 60th birthdays of Jean-Paul Blaizot and Larry McLerran will be held at IPhT, Saclay and IAP, Paris from April 23rd to 25th, 2009.

B. Eynard
26/03/2009
B. Eynard
A mini workshop on the work of B. Eynard and N. Orantin has taken place in december 2008 at the IPMU (Institute for the Physics and Mathematics of the Universe) inTokyo. It was devoted to the application of a topological recursion, recently discovered by B. Eynard and N. Orantin in the framework of random matrix theory, to topological string theory. More information : http://www.ipmu.jp

Henri Orland, président de la commission de Physique Statistique de l'IUPAP
02/02/2009
Henri Orland, président de la commission de Physique Statistique de l'IUPAP
Depuis novembre 2008, Henri Orland est président de la commission C3-Physique Statistique de l'IUPAP(*). Il est également vice-président de l'IUPAP. (*) International Union for Pure and Applied Physics

Jean-Paul Blaizot obtient le prix J. Hans D. Jensen
02/02/2009
Jean-Paul Blaizot obtient le prix J. Hans D. Jensen
L'Institut de Physique Théorique de l'Université Ruprecht-Karls d'Heidelberg vient de décerner à Jean-Paul Blaizot le prestigieux prix "J. Hans D. Jensen", pour ses travaux sur la chromodynamique quantique à température finie, le plasma quarks-gluons et le groupe de renormalisation exact.

Elle pense le monde en équations
09/12/2008
Elle pense le monde en équations
Une interview de Géraldine Servant, physicienne de l'IPhT en détachement au CERN, par Les Quotidiennes, un site de la Tribune de Genève.

Chiara Caprini
08/10/2008
Chiara Caprini
<p><a href="/Phocea/file.php?reload=1226930371&amp;class=newsImg&amp;file=_164_0_.jpg"><img style="border:0;margin:8px;" src="/Phocea/file.php?reload=1226930371&amp;class=newsImg&amp;file=_164_0_.jpg" alt="img" width="80" align="left" /></a> Comme annonc&eacute; <a href="http://ipht-i.cea.fr/Phocea/Vie_des_labos/News/index.php?act=visu&amp;id_news=137">en juillet 2008 </a><a href="http://ipht.cea.fr/Pisp/chiara.caprini/"> Chiara Caprini</a> a &eacute;galement pris ses fonctions de chercheur CNRS affect&eacute;e &agrave; l'IPhT le 1er octobre 2008.
More

Filippo Vernizzi
03/10/2008
Filippo Vernizzi
<p><a href="/Phocea/file.php?reload=1223042232&amp;class=newsImg&amp;file=_163_0_.jpg"><img style="border:0;margin:8px;" src="/Phocea/file.php?reload=1223042232&amp;class=newsImg&amp;file=_163_0_.jpg" alt="img" width="80" align="left" /></a>Dal primo di ottobre 2008, l'IPhT accoglie Filippo Vernizzi, con un posto di ricercatore in fisica permanente CEA. Specialista di cosmologia e di relativit&agrave; generale, Filippo si &egrave; addottorato all'Universit&agrave; di Ginevra, ha poi lavorato a Parigi, ad Helsinki e, pi&ugrave; recentemente, all'International Center for Theoretical Physics di Trieste. Far&agrave; parte del gruppo di cosmologia, e continuer&agrave; la sua ricerca sulla fisica dell'universo primordiale in relazione alla formazione di strutture a larga scala nell'universo. Gli auguriamo il benvenuto a Saclay.</p>

PRACE, Partnership for Advanced Computing in Europe
15/09/2008
PRACE, Partnership for Advanced Computing in Europe
A la demande de DSM, Jean-Marie Normand s'est impliqué dans le projet européen PRACE (Partnership for Advanced Computing in Europe) qui s'étale sur la période 2008-2009. Seize pays sont maintenant engagés dans ce projet qui prépare la création d'un service pérenne transeuropéen de calcul de haute performance comportant trois à cinq centres équipés de système "Pétaflopique" (*) (plus d'un ordre de grandeur plus puissant que les systèmes actuellement disponibles) à l'horizon 2010, l'ensemble relié par des réseaux à très haut débit. L'objectif est de mettre à la disposition de la communauté scientifique et industrielle européenne des moyens de calcul au plus haut niveau mondial. Cette infrastructure sera gérée comme une seule entité avec soumission de projets de calcul à un comité d'experts. Le programme, impliquant des dizaines de millions d'Euros, est partiellement financé par le 7ème Programme Cadre Européen.
More

Marco Cirelli unveils  PAMELA
12/09/2008
Marco Cirelli unveils PAMELA
Two scientific reviews, Cosmos Magazine and Science News, are interested in Marco Cirelli's and Alessandro Strumia's work posted on the Arxiv physics website, relative to data received from PAMELA, a space observatory. cosmosmag.pdf (445 Ko) sciencenews.pdf (76 Ko)

The New York Times
21/08/2008
The New York Times
When The New York Times is interested in the vitreous transition, and quotes Giulio Biroli's research. The complete article (97 Ko) in pdf.

David Kosower selected for an ERC Advanced Grant
21/08/2008
David Kosower selected for an ERC Advanced Grant
David Kosower won an European Research Council grant, for his project " Modern Methods for Perturbative Gauge Theories". These grants are extremely competitive: in the domain Physical Sciences and Engineering only 105 candidates have been selected (13 from France, and only 2 from CEA, both at the DSM).

CNRS
11/07/2008
CNRS
Chers tous, Je viens d'apprendre que Chiara Caprini a été affectée par le CNRS dans notre laboratoire. Au nom de tout le laboratoire, je lui adresse toutes nos félicitations. Chiara renforcera le groupe de Cosmologie et Astro-Particules, et nous nous réjouissons tous de cette affectation. Bien amicalement, Henri

In memoriam Alexei Zamolodchikov
03/07/2008
In memoriam Alexei Zamolodchikov
La conférence "Liouville Field Theory and Statistical Models" organisée à la mémoire d'Alexei Zamolodchikov, disparu prématurément le 19 octobre 2007, s'est déroulée du 21 au 24 juin 2008 à Moscou. Plusieurs chercheurs de l'IPhT participaient à cette manifestation, qui réunissait de nombreux amis et collègues d'Aliosha. Pour plus de détails voir ici et là .

Wonders of Gauge theory and Supergravity
03/07/2008
Wonders of Gauge theory and Supergravity
Le site intranet de la DSM publie un article relatif à la conférence. http://www-dsmi.cea.fr/fr/actualites/merveilleuse_conference

European School ON GROWTH AND SHAPES
25/03/2008
European School ON GROWTH AND SHAPES
The Enrage topical school "ON GROWTH AND SHAPES" consists of five introductory courses designated for PhD students and posdocs in physics and mathematics. The aim is a pedagogical presentation of basic concepts. At the end the audience should be well prepared to understand the current trends of research. It will take place in Paris at the Institut Henri Poincaré from June 2 to June 6, 2008. There will be ample time and space for discussions and interactions between the participants. It is followed by the 13th Itzykson Meeting PUZZLES OF GROWTH in Saclay

Workshop Disorder and localization phenomena 17-19 Mars
29/02/2008
Workshop Disorder and localization phenomena 17-19 Mars
The website of the workshop DISORDER AND LOCALIZATION PHENOMENA, FROM THEORY TO APPLICATIONS (ENS and IHP, Paris Mars 17-19) has been updated (in particular, there is now the timetable of the courses). At this stage, we would like to ask you to signal to us if you plan to attend, as we hope very much (just send an email to one of the organizers). We are looking forward to seeing you at the workshop, The organizers, giacomin@math.jussieu.fr fltonine@ens-lyon.fr cecile.monthus@cea.fr

Geraldine Servant and Iosif Bena selected for ERC Starting Grants
15/02/2008
Geraldine Servant and Iosif Bena selected for ERC Starting Grants
Two young physicists of IPhT, Geraldine Servant and Iosif Bena, have been selected under the first call for "Starting grants" launched by ERC(European Research Council): their projects are among the 431 which passed the quality thresholds for excellence, out of more than 9000 applications. Geraldine's project will be funded by ERC. It deals with the nature of dark matter and its manifestations. She will pursue her research at CERN. Iosif's project is on the reserve list of ERC, and will be funded by the French ANR. It deals with black holes and string theory.

PhD topics and Postdoctoral Positions  2008
10/12/2007
PhD topics and Postdoctoral Positions 2008
PhD topics for 2008 are visible here Postdoctoral positions for 2008 are visible here

Friedrich Wilhelm Bessel Research Award
29/11/2007
Friedrich Wilhelm Bessel Research Award
Our colleague Ruben Minasian has been elected the recipient of a Friedrich Wilhelm Bessel Research Award after having been nominated for this award by the German scientist Prof. Dr. Stefan Theisen, Max-Planck-Institut fuer Gravitationsphysik, Golm/Potsdam.

Activity report of SPhT
26/10/2007
Activity report of SPhT
The activity report presents an overview of the activities of the Service de Physique Théorique (SPhT) from June 2005 to May 2007.

Alexei Zamolodchikov
23/10/2007
Alexei Zamolodchikov
It is with a profound sadness that we learned yesterday morning of the decease of Alexei Zamolodchikov. Aliocha spent the year 2006 with us at SPhT, and we all appreciated very much his intelligence, his kindness and his warmth. We were all very happy that he was going to rejoin permanently our lab in the fall of 2008, after his return from Moscow. Aliocha was an immense physicist and the whole community of theoretical physics will miss him deeply. We present our deepest condolences to his family and friends. Henri Orland

Prix de l'Académie des Sciences
17/09/2007
Prix de l'Académie des Sciences
Deux de nos collègues ont vu leurs travaux récompensés par des prix de l'Académie des Sciences. Il s'agit de Cécile Monthus, qui a reçu le prix Gustave Ribaud et de Ivan Kostov, qui a reçu le prix Servant, conjointement avec Vladimir Kazakov de l'ENS. Je leur adresse nos plus vives félicitations au nom de tout le SPhT.

Black Holes, Black Rings and Modular Forms
11/09/2007
Black Holes, Black Rings and Modular Forms
Retrouvez sur le site de Saclay le reportage multimédia de François Legrand & Dominique Marchand pour DSM.tv. Le 37ième Institut d'été de Paris, organisé par Iosif Bena (SPhT, CEA), Boris Pioline (LPTHE & LPTENS, CNRS) & Gabriele Veneziano (Collège de France) a eu lieu le 24 août 2007.

Marco Cirelli
03/09/2007
Marco Cirelli
J'ai le très grand plaisir de vous annoncer que Marco Cirelli, qui est post-doc actuellement chez nous, a été affecté au SPhT comme CR2 par le CNRS. J'en suis très heureux et au nom de tous, je lui souhaite la bienvenue dans notre laboratoire. Henri Orland.

New students and postdocs
03/09/2007
New students and postdocs
On September 3rd, let us welcome : Patrick DESROSIERS , postdoc Frank SAUERESSIG , postdoc Ki-Seok KIM , postdoc Ashish SAXENA , postdoc Kristian KENNAWAY , postdoc Marco SARACENO , visitor Jeanne PARMENTIER, graduate student Olivier MARCHAL , graduate student Clément RUEF , graduate student

Giulio BIROLI, Young Scientist Award of IUPAP
22/03/2007
Giulio BIROLI, Young Scientist Award of IUPAP
Our colleague Giulio Biroli has received the prestigious "Young Scientist Award" of IUPAP International Union of Pure and Applied Physics), jointly with Tomohiro Sasamoto (Chiba University, Japan), for his groundbreaking works on glassy systems. This prize is awarded for the first time this year. H. Orland http://www.statphys23.org and http://www.stat.phys.titech.ac.jp

Christophe Grojean, 2006 Thibaud award winner
17/11/2006
Christophe Grojean, 2006 Thibaud award winner
Our colleague Christophe Grojean has been awarded the 2006 Thibaud prize for his contributions to theoretical particle physics beyond the standard model.

SPhT Workshop
26/09/2006
SPhT Workshop
The SPhT Workshop takes place at La Rochelle, october 4-6, 2006. Invited participants: David Bensimon (LPS-ENS), Xavier Viennot (LaBRI-Bordeaux), François Daviaud (SPEC-CEA), Jean-Michel Raimond (LKB-ENS). Program: scientific talks, welcome session for new members and visitors, prospective discussion sessions.

Junior Faculty Position in Theoretical Physics
13/07/2006
Junior Faculty Position in Theoretical Physics
The Theoretical Physics Department (SPhT) at CEA, Saclay invites applications for a permanent staff position in Theoretical Physics, at the junior faculty level. Candidates must have a PhD and postdoctoral experience. The position will be offered in one of the three following fields: Theoretical Cosmology, Perturbative Quantum Chromodynamics, Statistical physics of biological systems. The deadline for applications is September 15, 2006.

 

Retour en haut