|
Statut |
Confirmé |
|
Série |
P^3 |
|
Domaines |
astro-ph,hep-ph,hep-th |
|
Date |
Mardi 9 Fevrier 2021 |
|
Heure |
16:45 |
|
Institut |
IHP |
|
Salle |
Seminar via zoom https://ijclab.zoom.us/j/94900481972 |
|
Nom de l'orateur |
Skordis |
|
Prenom de l'orateur |
Constantinos |
|
Addresse email de l'orateur |
|
|
Institution de l'orateur |
University of Cyprus and Czech Academy of Sciences |
|
Titre |
MOND day - New gravitational degrees of freedom as a solution to the dark matter problem |
|
Résumé |
Cosmological and astronomical observations point to a gross mismatch between the
observed dynamics of visible matter with its gravitational influence, suggesting
the existence of dark matter. As at present a firm detection of a dark matter
particle is lacking, a less explored interpretation is that the underlying theory
of gravity may not be General Relativity. A hint that this may be the case is
Milgrom’s observation that discrepancies concerning galaxies are controlled by a
single, seemingly universal, acceleration scale. I will discuss this possibility
and focus on a particular relativistic realization constructed to reproduce
Milgrom’s Modified Newtonian Dynamics law at the scale of galaxies. I will how
this proposal leads to (i) correct gravitational lensing on galactic scales, (ii)
tensor modes propagating at the speed of light, and (iii) cosmological evolution
in line with observations of the Cosmic Microwave Background anisotropies and the
large-scale structure power spectrum on linear scales. |
|
Numéro de preprint arXiv |
|
|
Commentaires |
This seminar follows the one at 16:00 by David Spergel (Princeton University) |
|
Fichiers attachés |
|
