Chercheur CEA, directeur de l'Institut d'Astrophysique de Paris et

Professeur Chargé de Cours à l'école polytechnique

Institut de Physique Théorique,

CEA, IPhT, F-91191 Gif-sur-Yvette, France et  CNRS, URA 2306, F-91191 Gif-sur-Yvette, France


Institut d'Astrophysique de Paris

CNRS et UPMC, UMR 7095, 98 bis Bd Arago, 75014 Paris, France

  33-1 4432 8160  


Research activities: theoretical coslology including the exploration of inflationary models, the origin and evolution of the large scale structure of the universe, gravitational lenses and cosmic microwave background physics.

Curriculum Vitae

Dynamics of gravitational instabilities: my early works during my PhD thesis followed the invesigations of R. Schaeffer and R. Balian in which  so-called hierarchical models for the non-linear stages of the gravitational dynamics of a pressureless fluid were proposed. The quasilinear regime however appeared to be much easier to investigate thanks to ressumation techniques. It was then possible to show that,

Those efforts culminated with the publication of a long and exhaustive review paper, Physics Reports, 367, 1-128 (2002) written in collaboration with S. Colombi, E. Gaztanaga and R. Scoccimarro.

These rather formal approaches recently got new interests with the development of new resummation techniques that allow precision calculations. The basis of these methods can be found in papers by  R. Scoccimarro and M. Crocce, Phys. Rev. D 73, 063519 (2006) , Phys. Rev. D 73, 063520 (2006). I am now actively participating in the development of those techniques, with the Γ-resummation method, the computation of propagators with the eikonal approximation, in collaboration with P. Valageas (of IPhT), R. Scoccimarro and M. Crocce, Phys. Rev. D 78, 103521 (2008), Phys. Rev. D 81, 043516 (2010), Phys. Rev. D 82, 083507 (2010).

Cosmic Shear observations: the previous works on the large-scale structure of the universe led to rich studies on the phenomenology of weak gravitational lensing induced by the large-scale structure of the universe, e.g. the cosmic shear, 

Mode coupling effects in the statistical properties of the cosmic microwave background: another field where perturbation theory appraoches can be used is naturally the physics of the CMB. In this case mode coupling effects are a priori small but ubiquitous, either through the physics of the recombinaison, metric couplings among which the effects of gravitational lensing.

The search for new physics: the concordant model leaves a number of issues unanswered. Through various collaboration I explored over the years mechanisms at play during the inflationary phase; observational signature of possible relics, such as cosmic strings, and the effect the dark energy component on the large-scale structure growth.



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