Résumé / Abstract Seminaire_GReCO
SÉMINAIRE DU GRECO

"Phenomenology of dark matter via a bimetric extension of general relativity"

L. Bernard

The concordance cosmological model Lambda-CDM has tremendous successes at
cosmological scales. However when extrapolated down to galactic scales, it
meets severe challenges when compared to observations, and seems to be
fundamentally incompatible with the so-called phenomenology of MOND
(MOdified Newtonian Dynamics). On the other hand, MOND, which is a basic
set of observational phenomena relevant to galaxy dynamics and dark matter
distribution at galactic scales, is antagonistic to anything we would like
to call a fundamental theory. In this talk after a short review on the
MOND phenomenology, I will present a new dark matter model which intends
to reconcile within a single relativistic framework the antinomic
phenomenologies of dark matter when it is seen either at cosmological
scales or at galactic scales. This model is based on a bimetric extension
of general relativity coupled to a specific form of dark matter made of
two different species of particles, and thus can be seen as a compromise
between modified gravity and particle dark matter.

lundi 16 février 2015 - 11:00
Salle des séminaires Évry Schatzman,
Institut d'Astrophysique de Paris

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