Résumé / Abstract Seminaire_GReCO

"Model of dark matter and dark energy based on gravitational polarization"

A. Le Tiec
Institut d'Astrophysique de Paris (Paris, France)

While the Lambda-CDM model has proved to be extremely successful in explaining the fluctuations of the CMB and the growth of structures from initial perturbations, it barely explains the basic phenomenology of dark matter at galactic scales. The modified Newtonian dynamics (MOND) has been proposed as an alternative to the dark matter paradigm in order to account for that phenomenology. It postulates a modification of the standard laws of gravity in the absence of dark matter. If MOND serves very well for these purposes, its application to the realm of cosmology is rather limited. By extending the earlier works of L. Blanchet, we shall propose a third alternative in the form of a model of dark matter and dark energy based on the concept of gravitational polarization. This relativistic model will be shown to benefit from both the successes of Lambda-CDM at cosmological scales, and the phenomenology of MOND at galactic scales.

lundi 28 avril 2008 - 11:00
Salle des séminaires Évry Schatzman,
Institut d'Astrophysique de Paris

Page web du séminaire / Seminar's webpage