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Jorge arrival at IPhT!

Jorge arrival at IPhT!

Jorge FERNANDEZ DE COSSIO DIAZ joined the IPhT on September 2, 2024.

Next Carlo Heissenberg's arrival at IPhT!

Next Carlo Heissenberg's arrival at IPhT!

Carlo Heissenberg graduated with flying colors in 2019 from the Scuola Normale Superiore di Pisa, the Italian twin sister of the Ecole Normale de Paris. His initial research focused on the infrared properties of gravitational theories and higher spin theories from the perspective of asymptotic symmetries, a topic that later found phenomenological applications in the context of gravitational wave studies. It was during his first postdoctoral period at Nordita-Uppsala (2019-2023) that Carlo started working on gravitational wave physics using ideas borrowed from particle physics, such as scattering amplitudes and eikonal exponentiation in particular. He quickly became a leader in the field, publishing several important papers with world-famous physicists such as Gabriele Veneziano.

Next arrival of Olivier Gingras at IPhT!

Next arrival of Olivier Gingras at IPhT!

Olivier Gingras will join the IPhT in early 2025 on a permanent joint position at the IPhT and the QCC, Flatiron, New York. Part of the challenge of this position will be to facilitate interactions and collaborations between the two institutes on the theme of the quantum N-body problem.

A Marc Barthélémy and Vincent Verbavatz's new book: Statistics of Urban populations.

A Marc Barthélémy and Vincent Verbavatz's new book: Statistics of Urban populations.

The new book written by Marc Barthélémy and Vincent Verbavatz's, "Statistics of Urban populations", has just been published in December 2023 by Oxford University Press.

Welcome to Anne Capdepon, Deputy Head of Research Support at the IPhT.

Welcome to Anne Capdepon, Deputy Head of Research Support at the IPhT.

Welcome to Anne Capdepon, Deputy Head of Research Support at the IPhT. We are delighted to welcome Anne Capdepon, who joined the Institute on 1 December. She will be in charge of Research Support.

The first images taken by Euclid revealed

The first images taken by Euclid revealed

On 7 November 2023, the first images taken by Euclid, an ESA satellite launched on 1 July 2023, were revealed.

Celebration of IPHT's 60 years birthday

Celebration of IPHT's 60 years birthday

The Institute of Theoretical Physics (IPhT), formerly SPhT, is internationally known for the excellence of its scientific research, but has also a very ancient history. Its evolution is inextricably linked to that of the CEA and is almost as old. Its adventure began in 1947 with a small group of physicians passionated for abstraction, and to date more than 500 people have shared the life of the Institute, as well as the many visitors from all over the world. Today, 48 permanent researchers, 25 graduate students and 30 postdoctoral fellows, as well as the support staff, work at IPhT.

Célébration des 60 ans de l'IPhT

Célébration des 60 ans de l'IPhT

9 et 10 novembre 2023

Médaille de Physique of the French Science Academy

Médaille de Physique of the French Science Academy

On October 18, the French Académie des Sciences awarded François David the Médaille de Physique 2023.

Death of Michel Gaudin (02/12/1931 -- 04/08/2023)

Death of Michel Gaudin (02/12/1931 -- 04/08/2023)

Michel Gaudin, French mathematical physicist, engineer from the Ecole Polytéchnique (Class 1951) and Ingénieur des Ponts et Chaussées, died on August 4th, 2023, aged ninety-two years old. Gaudin joined the Commissariat à l'Énergie Atomique in 1956, first in the Service de Neutronique Expérimentale, then in the Service de Physique Théorique (later Institut de Physique Théorique, IPhT). He spent his entire career there, with the exception of one year at Stony Brook in 1970.

Henry Navelet (1938-2023)

Henry Navelet (1938-2023)

Henri Navelet died on July 3, 2023 in Bordeaux, at the age of eighty-four.

Conference et Workshop : Black-Hole Microstructure V

Conference et Workshop : Black-Hole Microstructure V

Conference: June 5 - 9 Informal workshop: June 12-16

Matt Von Hippel is to join IPhT on September 1.

Matt Von Hippel is to join IPhT on September 1.

Matt von Hippel went to Stony Brook University for his doctoral studies after obtaining an undergraduate degree at Tufts. He obtained his PhD in 2014, on N=4 supersymmetric Yang-Mills theory. His advisor was Michael Douglas. During his PhD he developed a method to bootstrap perturbative scattering amplitudes in quantum field theories. He then spent three years as a postdoc at the Perimeter Institute, where he continued working on bootstrapping higher-loop amplitudes in the N=4 theory. In 2017, he moved to the Niels Bohr Institute in Copenhagen, first as a postdoc and later as an Assistant Professor. Matt is interested in the broad variety of integral functions that appear in scattering amplitudes. He seeks to understand them using novel integration methods. He has already discovered surprising iterative structures in them.

Antoine Bourget joins the IPhT as a permanent researcher!

Antoine Bourget joins the IPhT as a permanent researcher!

We are pleased to announce that Antoine Bourget will join the IPhT permanent researchers team, as of September 1, 2023. After studies at Ecole Polytechnique and Ecole des Mines, Antoine Bourget did a Ph.D. at LPTENS, followed by post-doctoral studies at the University of Oviedo, Imperial College London, and IPhT (joint with LPENS). Antoine is an expert of strong coupling phenomena in quantum field theory, which encapsulate the vast field of problems outside the reach of perturbation theory, from classical field configurations (monopoles, instantons) to quantum effects (quark confinement, low-energy structure of the proton). Using algebra and geometry, he has been striding the bridge provided by string theory and supersymmetric field theory to address the far-reaching problem of the classification of conformal field theories and the study of the renormalization group flows connecting them. Welcome among us Antoine!

The Benchmark for Quantum Computer Performance (BACQ)

The Benchmark for Quantum Computer Performance (BACQ)

The BACQ project, launched as part of France's national quantum strategy within the LNE's MetriQs program, aims to establish a benchmark for evaluating the performance of future quantum computer technologies. Coordinated by Thales, the consortium involves three CEA institutes. The consortium is crucial for the development of quantum computing, and will also be crucial for industrial end-users. Quantum computing is set to revolutionize a wide range of technical fields and business sectors, from optimization in logistics, finance and scheduling, to simulation in research, engineering and industry. But how to measure the performance of the various technologies being developed for future quantum computers, with objectivity, reliability and comparability? And this, in a context of media hype and strong competition. This is the challenge of the BACQ project, which aims to establish quantitative, meaningful and ergonomic benchmarks for end users in the industry.

Nomination of Henri Orland to the American Academy of Arts and Sciences

Nomination of Henri Orland to the American Academy of Arts and Sciences

The election to the American Academy of Arts and Sciences of our friend and colleague Henri Orland (Institute of Theoretical Physics) crowns an outstanding scientific career dedicated to fundamental research. Henri Orland's work in statistical physics has led to essential advances in our understanding of disordered systems, combinatorial optimization, and the study of soft matter, while also giving rise to original applications to the biophysics of nucleic acid and protein folding and to the problem of sequence alignment in molecular biology. Full text: FM_Orland_EN.pdf (2.8 Mo)

Calculating the Witten-Kontsevich intersection numbers

Calculating the Witten-Kontsevich intersection numbers

The "Witten-Kontsevich intersection numbers" are scattering amplitudes in the context of the most simplified possible model of quantum gravity and string theory: a very low-energy quantum gravity, simplified to the extreme to keep only the fundamental phenomenon of topology fluctuations. These are positive integer or rational numbers, and they are the basis of all the more complex string theories, and of all surface enumerative geometry, in particular in algebraic geometry. Moreover, the conjecture of E. Witten, whose proof gave the Fields Medal to M. Kontsevich, indicates that these same numbers are relevant in almost all problems of mathematical physics: random matrices, statistical physics on a random surface, wave propagation in a canal, or the semi-classical approximation of the solutions of Schrödinger equations, and of all field theories in quantum physics. In particular, they play an important role in the black-hole model developed by Jackiw-Teitelboim.

Monica Guica receives the CNRS bronze medal for the year 2023!

Monica Guica receives the CNRS bronze medal for the year 2023!

Since 2016 Monica Guica has been working at the Institute of Theoretical Physics in Saclay (CEA/CNRS) in the field of the relation between quantum gravity and conformal quantum theories. In particular, she explores the correspondence between quantum gravity on a spacetime and certain field theories based on the edge of the first spacetime. Using a term used in optics, this correspondence is called "holographic" because all the information contained in a black hole is coded on its surface. This medal rewards her work, in particular that on the integrable deformation of type "J TBar" (J being a current and TBar a component of the tensor-energy impulse) of a two-dimensional field theory invariant by conformal transformations [2]. Congratulations Monica! Links: CNRS' announcement https://arxiv.org/abs/1710.08415 CEA/DRF's announcement

Kirone Mallick winner of the 2022 Physics French Society (SFP) Paul Langevin Prize

Kirone Mallick winner of the 2022 Physics French Society (SFP) Paul Langevin Prize

The jury of the Langevin Prize, meeting on 10 January 2023, awarded Kirone Mallick, physicist at the IPhT, the 2022 Langevin Prize of the French Physical Society for his remarkable work in statistical physics and concerning stochastic processes. Kirone Mallick works at the Institut de Physique Théorique in Saclay (CEA/CNRS) in the field of non-equilibrium statistical physics. As a specialist in exact solutions, he develops analytical approaches in which one-dimensional exclusion models play an important role. His work combines physical intuition and mathematical dexterity in a remarkable way. The breakthroughs he has made on paradigmatic models of statistical physics use an arsenal of methods ranging from classical and quantum integrability to more macroscopic approaches focusing on fluctuations or large deviations. His work on single-file diffusion brilliantly illustrates the complementarity between these different methods.

Bienvenue à Mariem Bouhajja au sein de l'équipe support IPhT

Bienvenue à Mariem Bouhajja au sein de l'équipe support IPhT

Bienvenue à Mariem Bouhajja que nous accueillons au sein de l’équipe support IPhT pour une formation en alternance BTS Informatique. Sous le pilotage de nos deux informaticiens Laurent Sengmanivanh et Philippe Girault, elle participera à la vie du site web de l’IPHT, à ses mises à jour, et contribuera à sa refonte dans le cadre du projet en cours pour la DRF.

ANR Dimers meeting at IPhT on 18 October 2022

ANR Dimers meeting at IPhT on 18 October 2022

The dimer model and related models of statistical mechanics keep raising questions almost a century after they were defined: limit shapes and fluctuations, integrability, connections to gauge theories... Physicists and mathematicians try to solve these questions by using methods from quantum field theory, combinatorial bijections, representation theory, differential geometry and discrete complex analysis. Several specialists of the field in France will meet at IPhT on Tuesday 18 October 2022 for a series of talks. The scientific program is as follows web page 10.15-11.15: Thierry Lévy (LPSM, Sorbonne Université), Recent progress in Yang-Mills theory in two dimensions 1.30-12.30: Jean-Marie Stéphan (ICJ, Université Claude Bernard Lyon-1), 2-3: Béatrice de Tilière (CEREMADE, Université Paris-Dauphine), The dSKP recurrence: combinatorial aspects and geometric systems 3.

Preparation of the exploitation of the Euclid mission

Preparation of the exploitation of the Euclid mission

The IPhT is strongly involved in the preparation of the scientific exploitation of the Euclid mission. This participation is done at two levels. Francis Bernardeau is in charge of the coordination of the Science Performance Verification, an exercise that aims to ensure that the core objectives of the mission - constraints on the parameters of the dark energy equation of state - will be achieved given what is known about the general parameters of the mission. But more generally, the IPhT researchers are involved in the preparation of the tools necessary for the analysis of cosmological data. In particular, it is a question of developing and validating the tools allowing to predict the expected observables for a large variety of cosmological models. Thus, Filippo Vernizzi coordinates the efforts within the Euclid consortium to develop simulations and theoretical tools to study the non-linear development of modified gravity models.

Retreat of the IPhT in Autrans : aftermath

Retreat of the IPhT in Autrans : aftermath

The retreat of the Institute of Theoretical Physics was held in Autrans (Vercors) from May 23 to 25. The approximately one hundred participants enjoyed the benefits of the altitude and the gorgeous environment surrounding the Escandille congress center, which hosted the event. This intense and joyful retreat provided an opportunity to strengthen the cohesion between members of our laboratory and to discuss among ourselves issues of science and the life of the Institute. The IPhT is characterized by a broad spectrum of research topics. In order to highlight the skills and to pedagogically transmit the knowledge to other non-expert colleagues, 7 scientific presentations of IPhT researchers were organized, complemented by 2 presentations held by external speakers, Professors Luc Blanchet (Institut d'Astrophysique de Paris, long-term visitor at IPhT) and Emil Martinec (University of Chicago).

Arrival of Ben Wieder on next september

Arrival of Ben Wieder on next september

We are pleased to announce that Ben Wieder will arrive at the IPhT at the end of September 2022 on the position of permanent junior researcher. Benjamin Wieder completed his PhD at the University of Pennsylvania with Charlie Kane in 2016.He was then a postdoc in Andrei Bernevig's group at Princeton University. He is currently a postdoc at MIT, working with T. Senthil among others. He is a theoretical physicist of condensed matter and more specifically of electronic properties in materials with topologically non-trivial band structure. He has worked on the combined aspects of geometry and topology in materials with complex nodal surfaces. He then studied the relationships between energy band connectivity of solids, structural chirality, topology and magnetism. He collaborated with Zahid Hasan's group at Princeton to identify candidate materials with these new properties.

Arrival of Dalimil Mazáč at IPhT

Arrival of Dalimil Mazáč at IPhT

We are pleased to announce that Dalimil Mazáč will join the IPhT as a CEA Permanent Researcher as of August 1, 2023. Dalimil prepared his thesis at the Perimeter Institute under the supervision of Davide Gaiotto, he then did a first postdoc at the SCGP at Stony Brook before joining the IAS at Princeton where he will stay until he will join our Institute. During his thesis, Dalimil wrote a paper on Analytic Bounds and Emergence of AdS2 Physics from the Conformal Bootstrap which raised a lot of interest, as he introduced the notion of analytic functional crucial to obtain rigorous bounds in the conformal bootstrap framework. Even more remarkably, his approach is in fact equivalent to Viazovska's solution of the optimal sphere stacking problem in dimension 8, as Dalimil discovered in later developments.

Maps day at IPhT on 24 June 2022

Maps day at IPhT on 24 June 2022

In the past 10 years, the French community working on maps on surfaces has come together several times per year during the so-called "maps days". The next edition of these maps days will take place at IPhT on Friday 24 June 2022. The scientific program is as follows: see also the webpage Program: 10h15-11h15 : Nicolas Curien (Université Paris-Saclay), Parking on the infinite binary tree 11h30-12h30 : Fedor Levkovich-Maslyuk (Université Paris-Saclay / CEA), Critical phenomena for dually weighted graphs and spanning forests via matrix models 14h-15h : Zéphyr Salvy (Université Gustave Eiffel), Random planar maps decomposed into blocks: a phase study 15h15-16h15 : David Keating (University of Wisconsin-Madison), k-tilings of the Aztec diamond The talks will take place in person in the Bloch amphitheater.

26th Itzykson conference: Black-Hole Microstructure IV

Conference: June 6-10 - Workshop: June 13-17

26ème conférence Itzykson : "Black-Hole Microstructure IV"

La description microscopique des trous noirs est un défi depuis plus de quarante ans. Il existe aujourd'hui un certain nombre d'approches prometteuses pour résoudre ce problème et l'objectif principal de cette conférence et de ce workshop est de réunir des experts dans ces domaines afin d'identifier les synergies, de s'engager dans une critique constructive et de résoudre les conflits apparents. Une attention particulière sera accordée à la dynamique de la microstructure des trous noirs : comment la matière entrante est brouillée et comment l'information est récupérée. La conférence se tiendra seulement en ligne le lundi 6 juin (jour férié en France) puis en personne à l'IPhT, CEA-Saclay du mardi 7 au vendredi 10 juin. Chaque jour de la conférence sera également retransmis. Inscription sur le site web.

Colloquium Rencontres de l'IPhT in Autrans (Vercors) from 23 to 25 May.

Colloquium Rencontres de l'IPhT in Autrans (Vercors) from 23 to 25 May.

The next colloquium Rencontres de l'IPhT conference will be held in Autrans (Vercors) from 23 to 25 May. It will consist of conferences and lectures concerning both the major fields of research in theoretical physics and supporting activities. The main themes of physics will be: - Mathematical physics: group A - Cosmology, particles and nuclei: group B - Statistical physics - condensed matter: group C Main goals: - To share knowledge on scientific topics and strengthening cohesion within the Institute. - To bring together all of the Institute's collaborators in order to discuss common subjects and activities and to strengthen interactions between members of the different teams, including support. - To unite the teams around a common project. See you soon in Autrans!

$SLE multifractal news$

SLE multifractal news

Bertrand Duplantier (IPhT) and his collaborators have just obtained an exact expression for the generalized multifractal spectrum, which characterizes the highly singular behavior of the universal fractal curve, here arcuate in a semi-infinite logarithmic spiral, and associated with Schramm-Loewner Evolution (SLE), a paradigmatic planar stochastic process. The method of passage through Liouville quantum gravity is successfully applied there. The attached file contains a simplified presentation of this mathematical physics result. Developped results

Public talk of Stephane Lavignac on Tuesday March 15th

Public talk of Stephane Lavignac on Tuesday March 15th

Stéphane Lavignac (IPhT) will be giving a public talk (in French) about « Les neutrinos Les neutrinos, ces particules mystérieuses qui interrogent les physiciens on Tuesday, March 15th at 7 pm in the framework of the Conférences Université Citoyenne at the Patronage laïque Jules Vallès in Paris. https://www.patronagelaique.eu/event-details/les-neutrinos-ces-particules-mysterieuses-qui-interrogent-les-physiciens-1 You also can find this conference on Youtube: Conferences

Cédric Villani at IPhT on March 1st

Cédric Villani at IPhT on March 1st

We will have the pleasure to welcome Cédric Villani at IPhT on Tuesday, March 1st morning. Mathematician, Cédric Villani is a university professor, laureate of the 2010 Fields medal and former director of Institut Henri Poincaré. He is also deputy (MP) for Essonne's 5th constituency in the National Assembly of France. Here is the program of the meeting : 09:00-09:10 introduction, by Catherine Pépin et François David 09:10-10:00 scientific talk by Cédric Villani 10:00-10:30 break 10:30-11:30 talks by IPhT members : Kirone Mallick, Philippe Brax, Jérémie Bouttier 11:30-12:00 question session, chaired by Bertrand Duplantier Conference site The meeting will take place in amphi Bloch and will be streamed online via BBB and on www.youtube.com/c/IPhTTV.

Summer School in Cargèse around exotic superconductivity

Summer School in Cargèse around exotic superconductivity

We announce the ExoSup Summer School on unconventional superconductivity,co-organized by Catherine Pépin from IPhT..It will take place at the Institut d'Etudes Scientifiques de Cargèse from June 13 to 25, 2022.

Langevin Prize of the French Society of Physics for Mariana Graña

Langevin Prize of the French Society of Physics for Mariana Graña

Good news for the IPhT, Mariana Grana has just received the Langevin Prize of the French Society of Physics! Congratulations to Mariana for this well deserved success! Prize citation:

Arrival of Luc Blanchet

Arrival of Luc Blanchet

We warmly welcome Luc Blanchet, who will be a regular visitor of the IPhT during the next six month.

Arrival of Pierre Fleury

Arrival of Pierre Fleury

We are pleased to welcome Pierre Fleury, who joins the astrophysics and cosmology group of the IPhT as of February 1st. Pierre Fleury is a specialist of general relativity and gravitational lensing. After a PhD at the Institut d'Astrophysique de Paris in 2015, he successively held postdoctoral positions at the University of Cape Town in South Africa, the Department of Theoretical Physics at the University of Geneva and the Institute of Theoretical Physics at the Universidad Autónoma de Madrid. His research program covers both very formal aspects, such as the study of backreactions in alternative theories of relativity or the study of the concept of emergent gravity, and phenomenological aspects such as the exploration of gravitational lensing effects in a wide variety of contexts. He now joins the IPhT as a permanent CNRS researcher of section 02. We welcome him !

Maxime Leroy joins the IPHT support team

Maxime Leroy joins the IPHT support team

We are pleased to welcome Maxime Leroy to the IPHT's support team, who took up his post on January 19th as part of an 18-month fixed-term contract. Maxime is a graphic video editor and a graduate of the EMC (Ecole supérieure des métiers de l'image, du son et de la création 2D-3D). Trained by Philippe Girault and Laurent Sengmanivanh, he will be responsible for the use of our new equipment in the Itzykson room and soon in the Bloch amphitheatre. His technical skills will be invaluable for the recording and retransmission of conferences, courses and seminars organized by researchers and will thus contribute to a better influence of the Institute. He will also be your contact for announcements and room reservations on the IPhT website. Welcome to Maxime !

Catherine Pépin appointed head of the IPhT

Catherine Pépin appointed head of the IPhT

Welcome to Catherine Pépin, appointed head of the Institute on January 1st, 2022! She succeeds François David who held this position since January 1st, 2017. François will continue his research activity at the IPhT as Research Director Emeritus, and we warmly thank him for the work accomplished during these five years at the head of the laboratory. We also send our congratulations to Catherine, as well as our best wishes for success and fulfillment in this new position.

Junior Permanent Position in Theoretical Quantum Physics at IPhT

Junior Permanent Position in Theoretical Quantum Physics at IPhT

The Institut de Physique Théorique invites applications for a junior CEA permanent position in quantum condensed matter theory or/and quantum information sciences. Candidates with interest in one of the following scientific areas will be considered with the highest priority: Quantum matter, quantum and topological materials, classical and quantum simulations, quantum computing, quantum communication Interested candidates should apply via AcademicJobsOnline (Job #20967) and applications should be received by March 1st, 2022 in order to receive full consideration. Contact: position2022@ipht.fr

Junior Permanent Position in Theoretical Physics at IPhT

Junior Permanent Position in Theoretical Physics at IPhT

The Institut de Physique Théorique invites applications for a junior CEA permanent position in theoretical physics. Candidates with interest in one of the two following scientific areas will be considered with the highest priority: « High-energy phenomena and quantum field theory, from amplitudes and integrability to gravitational waves » « Applications of statistical physics: physics of life, artificial intelligence, neuroscience, complex systems, etc.». Interested candidates should apply via AcademicJobsOnline (Job #20703) and applications should be received by Feb. 15, 2022 in order to receive full consideration. Contact: position2022@ipht.fr

Un lien entre la masse du boson de Higgs et la constante cosmologique

Un lien entre la masse du boson de Higgs et la constante cosmologique

Pendant des décennies nous avons progressé dans l'étude des lois fondamentales de la nature à travers les collisionneurs des particules. Le Grand Collisionneur de Hadrons (LHC) a eu un impact énorme sur notre connaissance de la physique des particules. Une des conséquences les plus importantes de ce programme expérimental est que la valeur de la masse du boson de Higgs et son origine restent mystérieux.

Série de conférences sur l’utilité des simulateurs et des ordinateurs quantiques pour résoudre des grands problèmes en physique.

Série de conférences sur l’utilité des simulateurs et des ordinateurs quantiques pour résoudre des grands problèmes en physique.

Nous organisons à l’IPhT une série de conférences sur l’utilité des simulateurs et des ordinateurs quantiques pour résoudre des grands problèmes en physique. voir https://qcs.quantum.paris pour davantage d'informations.

Mathematical Harmony and the Quantum World

Mathematical Harmony and the Quantum World

A conference honouring the 60 years anniversary of our former colleague Denis Bernard will take place at the ENS Paris : 45 rue d’Ulm, Salle Dussane - October 14-16, 2021.

Avec une mémoire quantique, l’ordinateur quantique « maigrit » d’un facteur mille !

Avec une mémoire quantique, l’ordinateur quantique « maigrit » d’un facteur mille !

Des physiciens théoriciens de l'IPhT montrent qu'en dotant un processeur quantique d'une mémoire quantique, il est possible de réduire de trois ordres de grandeur le nombre de bits quantiques nécessaires à la résolution d'un problème emblématique.

Prochain cours de Physique Théorique : Celestial Holography Primer par Andrea Puhm (CPhT, École Polytechnique)

Fri, Sep. 24th, 2021 10:00

Prochain cours de Physique Théorique : Celestial Holography Primer par Andrea Puhm (CPhT, École Polytechnique)

Site de la Conférence Dates : -le 24 septembre à 10h -le 1er octobre à 10h -le 8 octobre à 10h -le 15 octobre à 10h -le 22 octobre à 10h Le cours sera en mode hybride : -Présentiel à l’IPhT : Amphi Bloch (masques obligatoires) -Vidéoconférence (interactif avec inscription obligatoire sur le site pour recevoir le lien) En live (non interactif) via Ipht-TV

The art of mathematical physics

The art of mathematical physics

Our friend and colleague Hubert Saleur has recently turned 60. A conference celebrating his anniversary and focusing on his numerous contributions to condensed matter physics, low-dimensional quantum field theory, and mathematical physics will take place at the IPhT on September 20-23, 2021. Participation and talks will be in hybrid mode. On-site participants will have to wear masks inside the Institute building and will have to show a valid immunisation certificate or a valid negative test for SARS-CoV-2 (of less than 72 hours) upon registration on Monday morning. Since the maximum capacity of the Amphi Claude Bloch is restricted to 50 persons, registration is necessary. More details can be found on the webpage of the conference : http://www.phys.ens.fr/~jacobsen/AMP21.html Organisers: Jesper Jacobsen (ENS Paris), Didina Serban (IPhT Saclay), Nicholas Warner (USC Los Angeles)

Correlation functions and wave functions in solvable models

Correlation functions and wave functions in solvable models

The meeting will be held at the Institut de Physique Théorique (IPhT-CEA) in Saclay from Sept 13 to 15 and at the Ecole Normale Supérieure (ENS) in Paris on Sept 16. It will bring together experts in the field of integrable systems and address important open questions in the calculation of correlation functions and wave functions in integrable models, with applications to N=4 Super-Yang-Mills theory, Heisenberg spin chains and 2d relativistic QFTs. Participation will be in person only. Participants will have to wear masks inside the Institute building and will have to show a valid immunisation certificate or a valid negative test for SARS-CoV-2 (of less than 72 hours) upon registration on Monday morning. The maximum capacity of the Amphi Claude Bloch being restricted to 50 persons, registration is necessary and it can be done via the corresponding link on the webpage of the conference: https://indico.in2p3.

Deux étudiants de l'IPhT primés!

Deux étudiants de l'IPhT primés!

Accessit au prix Saint-Gobain pour Giuliano Giacalone La Société française de physique (SFP) a décerné l'accessit du prix Saint-Gobain 2020 à Giuliano Giacalone pour sa thèse. Giuliano a passé 5 mois à l'IPhT pour son stage de M1 en 2016, puis il est revenu en octobre 2017 pour y préparer sa thèse sous la direction de Jean-Yves Ollitrault, qu'il a soutenue le 30 novembre 2020. Dans cette thèse, il prouve que les collisions ultra-relativistes entre des noyaux déformés permettent de mesurer leur déformation de manière plus directe que les expériences traditionnelles de physique nucléaire de basse énergie.

Multipole Ratios : A New Window into Black Holes

Multipole Ratios : A New Window into Black Holes

CC BY 3.0 (as fig. 1 from Event Horizon TelescopeCollaboration, K. Akiyama et al., First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring, Astrophys.J. Lett.875(2019), no. 1, L5,1906.11242 ) More than a century after their theoretical discovery, black holes still hold many mysteries. We have developed new methods to calculate an infinite number of hitherto unknown parameters of any arbitrary black hole, some of which we believe could be observed in current and future experiments. Half of these multipoles are finite, and the other half vanish. Any ratio of two vanishing moments thus seems to be ill-defined. By embedding black holes in string theory, we develop a novel method to define and calculate such multipole moment ratios unambiguously for any black hole. In this way, we find an infinite number of previously unknown multipole ratios for any Kerr black hole.

Orazio Scarlatella lauréat du prix de thèse Physique des Ondes et de la Matière (PhOM) 2020

Orazio Scarlatella lauréat du prix de thèse Physique des Ondes et de la Matière (PhOM) 2020

Orazio Scarlatella, former doctoral student at IPhT, is the winner of the 2020 PhD prize "Physics of Waves and Matter" of the Physics Graduate School of the University of Paris-Saclay, in the speciality "Theoretical Physics, Numerics and Modelling". Orazio Scarlatella's thesis work focuses on the dynamics of dissipative quantum many-body systems. These problems are of great richness and complexity because they combine the effects of interactions, quantum fluctuations, and out-of-equilibrium physics. The work of O. Sacarlatella consisted of several new conceptual and methodological developments in this field at the interface between correlated materials and quantum optics, with applications to systems such as arrays of superconducting cavities or ultra cold atoms trapped in optical arrays.

Modeling the city: an equation ends centuries-old controversies

Modeling the city: an equation ends centuries-old controversies

(c) Leo Patrizi Marc Barthelemy and Vincent Verbavatz proposed a new equation to understand the distribution of urban populations in a country and their results are published in the journal Nature (online November 18, 2020) This equation, constructed from data for several countries, accounts for the first time for the temporal variations of urban populations and their organization. This stochastic equation of a new type (with two multiplicative noises, one gaussian and the other of the Levy type) highlights the importance of “interurban migratory shocks”, rare but significant population movements, and makes it possible to understand the hierarchical structure of cities and statistical regularities such as Zipf's law. More information and the interview with Marc Barthélémy

Quantum entanglement: A single photon takes two optical paths by

Quantum entanglement: A single photon takes two optical paths by "entangling" them!

An IPhT researcher, Nicolas Sangouard, and his partners from the universities of Geneva and Basel have succeeded for the first time in "intriguing" the outputs of two optical fibers sharing a single photon at a distance of 2 km. By this performance, they show how a form of quantum entanglement that is simple to produce can be distributed and detected over long distances. An important step towards the construction of a secure quantum the internet! Quantum entanglement or entanglement refers to a very surprising phenomenon in which two systems form a linked state, with the state of each individual system remaining undefined. Regardless of the distance between them, these systems have correlated physical properties. Without stopping being amazed, physicists have learned to use entanglement and to imagine technological applications that have no classical equivalent.

An strongly secured encryption

An strongly secured encryption

How do we protect the privacy of a communication if we cannot trust the devices used to communicate? Researchers from IPhT, the University of Basel and ETH Zurich have provided innovative answers to this question, which is at the heart of research in quantum cryptography. Hackers in possession of quantum computers pose a serious threat to some of today's crypto-systems. An interesting solution uses encryption methods based on keys produced by quantum principles. However, current quantum encryption protocols assume that the devices used to communicate are known and trustworthy. Otherwise, a door is opened for eavesdropping. A team of physicists around Nicolas Sangouard from IPhT and the University of Basel, as well as Professor Renato Renner from ETH Zurich, have developed the theoretical bases of a communication protocol that offers ultimate protection of the privacy and can be implemented experimentally.

Disparitions de Madeleine Porneuf, de Jacques Raynal et de Robert Lacaze

Disparitions de Madeleine Porneuf, de Jacques Raynal et de Robert Lacaze

En ce triste printemps 2020, les vents mauvais ont emporté plusieurs grands anciens de l'Institut. Nous tenons à leur rendre hommage et assurons leurs familles et leurs amis de notre amical souvenir. Madeleleine Porneuf (1934-2020): Rentrée au CEA en 1956, Madeleine Porneuf était Ingénieur Documentaliste, et a dirigé et développé pendant de très nombreuses années le service de documentation, au départ commun au Service de Physique Théorique (futur IPhT) et au Service de Physique des Solides et de Résonance Magnétique (SPSRM, futur SPEC), et ce jusqu'à sa retraite. Madeleine était une personnalité importante et marquante de l'Institut.

Du mouvement dans le groupe informatique!

Du mouvement dans le groupe informatique!

Départ de Patrick Berthelot: Après 18 ans passés au sein du groupe informatique de l'IPhT, Patrick Berthelot nous a quitté en mai pour un autre Centre et une autre Direction du CEA. Patrick est arrivé chez nous en 2002 comme Technicien Supérieur, et est devenu Ingénieur Informaticien en 2016. Administrateur système et réseau, il serait trop long de rappeler toutes les tâches qu'il assumait et tous les projets qu'il a porté. Mentionnons par exemple la conception et l'installation de notre système de visioconférence, et le passage de l'informatique scientifique de l'IPhT sur le réseau de l'Université Paris-Saclay.

David Kosower lauréat de l'ERC Advanced Grant

David Kosower lauréat de l'ERC Advanced Grant "Ampl2Einstein"

David Kosower vient d’obtenir l’ERC Advanced Grant Ampl2Einstein. Ce projet sera consacré au développement de nouveaux calculs perturbatifs pour l’étude de l´émission d´ondes gravitationnelles lors de la fusion de trous noirs ou d'étoiles à neutrons. Ces calculs de précision sont une étape cruciale afin de pouvoir extraire des observations des informations sur la structure de ces astres. L' ambition du projet “Ampl2Einstein” est de repousser les limites de la théorie quantique des champs et de développer le lien entre théories de Yang-Mills et théories de gravitation.

Network Physics and covid19

Network Physics and covid19

A virus spreads over the "contact network" whose nodes are individuals, and the link represents the possibility for the virus to spread between them. This contact network is therefore not necessarily equivalent to our social network and has a very complex structure. The study of this type of network is used today in epidemiology to understand how a virus spreads. Liberation released today an interview with Marc Barthelemy, director of research at the Institute of theoretical physics (CEA).

Un nouvel ouvrage co-écrit par Pierfrancesco Urbani, physicien à l’IPhT

Un nouvel ouvrage co-écrit par Pierfrancesco Urbani, physicien à l’IPhT

Le nouvel ouvrage Theory of simple glasses, co-écrit par Giorgio Parisi, Pierfrancesco Urbani , physicien à l’IPhT, et Francesco Zamponi, vient de paraître chez Cambridge University Press. Félicitations Pierfrancesco !

Un nouvel ouvrage co-écrit par Henri Orland, physicien à l'IPhT

Un nouvel ouvrage co-écrit par Henri Orland, physicien à l'IPhT

Le nouvel ouvrage Molecular Kinetics in Condensed Phases: Theory, Simulation, and Analysis, écrit par Ron Elber, Dmitrii E. Makarov, et Henri Orland, physicien à l'IPhT, vient de paraître chez Wiley. Félicitations Henri !

Un livre de François David

Un livre de François David

Un livre de François David, le tome 1 de la Théorie statistique des champs vient de paraître chez EDP Sciences dans la Collection Savoirs Actuels. Présentation de l'ouvrage: Les idées du groupe de renormalisation développées pour la physique statistique dans les années 1970, en grande partie grâce au prix Nobel de physique Kenneth Wilson, ont entièrement renouvelé ce que l’on appelait la théorie relativiste des champs quantiques, née dans les années 1930 et développée sous la forme de l’électrodynamique quantique dans les années 1950. Un résultat de ce renouvellement est la théorie statistique des champs, une boîte à outils de tout physicien théoricien, de la physique des hautes énergies à la physique statistique.

Philippe Brax (IPhT), representing UP Saclay in EuCAPT

Philippe Brax (IPhT), representing UP Saclay in EuCAPT

On July 10th, P2I-P2IO/UP Saclay became a part of EuCAPT and Philippe Brax represents Paris-Saclay in the Streering Committe

Lyon-Saclay Meeting December 16-17, 2019

Lyon-Saclay Meeting December 16-17, 2019

Meeting cancelled, and reported to 2020 (date to be fixed).

A Workshop on Astroparticles at the Institute Pascal

A Workshop on Astroparticles at the Institute Pascal

The Paris-Saclay AstroParticle Symposium 2019 has begun at the Institute Pascal The 2019 AstroPascal workshop on astroparticles is taking place place at the Pascal Institute of the Paris-Saclay University. It is organized by Philippe Brax of IPhT and Yann Mambrini of LPT-Orsay. Around 30 specialists of astrophysics, cosmology and particle physics will be invited to discuss and work on the themes: Dark Energy and Dark Matter. The format will be flexible enough to allow for strong interactions between participants. There will be working sessions every day and on Fridays, a « conference » format day with invited speakers. We have invited confirmed researchers and are strongly encouraging the presence of their students and/or postdocs. The ultimate aim is to initiate-continue-finalise research projects in a nice environment.

Bertrand Eynard lauréat du prix Claude Berthault (Prix de l'Institut de France)

Bertrand Eynard lauréat du prix Claude Berthault (Prix de l'Institut de France)

Bertrand Eynard est un physicien théoricien, qui après une thèse sur les matrices aléatoires (sous la direction de Jean Zinn-Justin), est devenu chercheur au CEA (Commissariat à l'énergie atomique et aux énergies renouvelables) depuis 1995. Ses travaux ont d'abord porté sur les matrices aléatoires où il a apporté d'importantes contributions et écrit et enseigné plusieurs cours. En 2004, il a introduit une nouvelle méthode algébrique pour le calcul du développement asymptotique des matrices aléatoires de grande taille, appelée la "récurrence topologique".

Quantum Field Theory : A book by François Gélis.

Quantum Field Theory : A book by François Gélis.

After having delivered for several years a course on quantum field theory at the Master program ¨High Energy Physics¨ at the Ecole Polytechnique, Francois Gelis's lecture notes have been published by Cambridge University Press in a volume entitled Quantum Field Theory: from basics to modern topics.

Qu’est-ce que la gravité ? A book by Philippe Brax, Etienne Klein and Pierre Vanhove

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.

Maxime Grandadam et Giuliano Giacalone, étudiants à l'IPhT, invités à l'émission

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

Shaking Strongly Correlated Electrons

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.

Matière noire : la théorie des trous noirs disqualifiée

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

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.

Topological phases of matter: from the quantum Hall effect to spin liquids (June 11th - July 6th, 2018)

Topological phases of matter: from the quantum Hall effect to spin liquids (June 11th - July 6th, 2018)

IPhT will host a 4-week program on topological phases in condensed matter. The goal of this program, dubbed TopMat, is to gather some experts in the field interacting topological phases, such as fractional quantum Hall states or quantum spin liquids in magnets, to discuss the latest theoretical and experimental developments, and to favor informal discussions and new collaborations. This program will welcome more than 30 invited participants in total, most of them from abroad and staying for more than one week. A preliminary list of participants is available on https://topmat.sciencesconf.org/. The detail scientific program, with about two talks per day (open to every one), will be available soon. Scientific coordinators : Thierry Jolicoeur (LPTMS, Université Paris-Sud), Philippe Lecheminant (LPTM, Université de Cergy-Pontoise) and Grégoire Misguich (IPhT, CEA Saclay). TopMat is organized and funded in the framework of the project 'PSI2' of the Université Paris-Saclay.

Program on topological phases of matter: from the quantum Hall effect to spin liquids (June 11th - July 6th, 2018)

Program on topological phases of matter: from the quantum Hall effect to spin liquids (June 11th - July 6th, 2018)

IPhT will host a 4-week program on topological phases in condensed matter. The goal of this program, dubbed TopMat, is to gather some experts in the field interacting topological phases, such as fractional quantum Hall states or quantum spin liquids in magnets, to discuss the latest theoretical and experimental developments, and to favor informal discussions and new collaborations. TopMat is organized and funded in the framework of the project 'PSI2' of the Université Paris-Saclay. Scientific coordinators : Thierry Jolicoeur (LPTMS, Université Paris-Sud), Philippe Lecheminant (LPTM, Université de Cergy-Pontoise) and Grégoire Misguich (IPhT, CEA Saclay).

Cirano De Dominicis 1927 - 2017

Cirano De Dominicis 1927 - 2017

It was with great sadness that we learned of the death of Cirano de Dominicis on April 4, 2017, at the age of 90 years. Cirano de Dominicis, a former student of École polytechnique and of Ecole des Mines, spent his entire career at the Atomic Energy Commission, where he participated in the founding of the theoretical physics group at Saclay. An outstanding scientist, his innovative work had profoundly influence on the fields of condensed matter physics, of the N-body problem, and later on the physics of disordered systems and spi glasses. He was Director of the Saclay theory group (then Service de Physique Théorique) from 1971 to 1979. He has been President of the French Society of Physics, and was the recipient of the Paul Langevin and Ricard Prizes of the French Society of Physics and of the CNRS Silver Medal.

Succession of the IPhT's Head

Succession of the IPhT's Head

Michel Bauer-François David

¨Le Monde¨ 2016 Research Prize for Rémi Louf

¨Le Monde¨ 2016 Research Prize for Rémi Louf

Rémi Louf, one of our former graduate students, was awarded by ¨Le Monde¨ one of the 2016' Prizes for Research. Congratulations!

2016 Philippe Meyer Prize in Theoretical Physics for Lenka Zdeborova

2016 Philippe Meyer Prize in Theoretical Physics for Lenka Zdeborova

The Philippe Meyer Institut of Theoretical Physics at the ENS has awarded its 2016' Prize to Lenka Zdeborova. The prize ceremony will take place on December 2nd. Congratulations!

2016 Thibaud Prize for Gregory Soyez

2016 Thibaud Prize for Gregory Soyez

The ¨Académie des Sciences, Belles-Lettres et Arts de Lyon¨ has awarded the 2016' Thibaud Prize to Gregory Soyez. Congratulations!

Langevin Prize for François Gélis

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

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)

Welcome to Monica Guica

Welcome to Monica Guica

It is with great pleasure that the IPhT greets Monica Guica. Starting September 1st, she joins the StringTheory group at IPhT. After graduating in Harvard in 2008, and three postdoctoral positions (one at IPhT), Monica got a tenure Professor position in Uppsala in 2014, and en 2015 she was the recipient of a Starting Grant from the European Research Council « Emergent-BH » (Emergent spacetime and maximale spinning black holes). She now joins the IPhT as a permanent CEA researcher. Welcome Monica!

21st Claude Itzykson Conference

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.

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

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.

Les faits marquants et les sites de la DRF sont en ligne

Les faits marquants et les sites de la DRF sont en ligne

Les sites et derniers faits marquants de la Direction de la Recherche Fondamentale du CEA sont à présent disponibles en ligne. Faits marquants et actualités de la DRF: Internet: http://ceasciences.fr/Phocea/Vie_des_labos/Ast/ast.php?t=actualites&id_unit=1&y=2016&voirpar=theme Intranet du CEA: http://drf-i.cea.fr/Images/astImg/1437/fm_drf_dec15_janv16.pdf Sites de la DRF: Internet: http://ceasciences.fr/index.php Intranet du CEA: http://drf-i.cea.fr/

Décès d'Albert Messiah

Décès d'Albert Messiah

Albert Messiah est décédé le 17 avril 2013, à l’âge de 92 ans. Albert Messiah est un des refondateurs de la communautée de physique théorique en France, et en particulier à Saclay, après la deuxième guerre mondiale. Tout jeune il rejoint les forces françaises libres en Afrique, en 1940, et la 2ème Division Blindée en septembre 1944. Ancien élève de l'École Polytechnique (X, 1940) et ingénieur du corps des Mines, il part après la guerre à Princeton auprès de Bohr et d'Oppenheimer, puis à l'université de Rochester.

Colloque de l'IPhT 2012, c'est fini, mais les transparents et les photos sont en ligne !

Colloque de l'IPhT 2012, c'est fini, mais les transparents et les photos sont en ligne !

Le colloque interne de l'IPhT s'est déroulé les 15,16 et 17 octobre à L'Isle sur la Sorgue. Le colloque réunissait tous les membres de l'IPhT (chercheurs de tous âges, support et administration) et trois invités scientifiques: Erik Verlinde (U. Amsterdam), Jean-Philippe Uzan (Institut d'astrophysique, Paris) et Thierry Dauxois (Ecole normale supérieure de Lyon). Dans une ambiance sympathique et détendue, mais studieuse, les participants ont dialogué et échangé sur leurs travaux de recherches, et se sont penchés sur les perspectives scientifiques de l'IPhT et les évolutions de l'environnement de travail. Nouveauté pour cette fois, des tables rondes scientifiques ont été organisées. Merci à tous pour leur participation. ipht.cea.fr/Meetings/LIsleSurLaSorgue2012/ (externe) - ipht-i.cea.

Gregory Soyez is the new IPhT Scientist Deputy Director

Gregory Soyez is the new IPhT Scientist Deputy Director

the IPhT has a new "Adjoint Scientifique" in the person of Gregory Soyez. We wish him all the best in this often difficult job, and thank him in advance for the service he provides to us all! We warmly thank Grégoire Misguich for his unstinting commitment and dedication to the IPhT's management over the past four years. The quality and precision of his work, his availability, his competence and his attentiveness will always be remembered. A huge thank you Grégoire on behalf of the whole institute!

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