Séminaire / Seminar GReCO |
| « The growth of gravitational instabilities in an expanding universe » |
|
Francis Bernardeau |
| The large-scale structure of the universe is thought to have emerged out of primordial metric fluctuations that have been amplified by gravitational instabilities throughout the cosmic expansion. However a self gravitating pressure-less fluid in an expanding background forms a complicated system for which, beyond the regime where the density and velocity perturbations are small, little is known. On the other hand being able to decipher the large-scale structure of the universe would bring a wealth of information on its matter and energy content and is therefore of crucial importance in the context of the coming surveys. In this talk I will present some historical perspectives on the approaches that have been used and then present how perturbation theory techniques can give insights into the growth of structure and into the physics of a self gravitating fluid in general. Latest results that these approaches have brought, in particular from resummation techniques, will be presented and commented. |
|
lundi 26 novembre 2012 - 11:00 Salle des séminaires François Arago Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |