Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series P^3
Subjects astro-ph,hep-ph,hep-th
Date Tuesday 9 February 2021
Time 16:45
Institute IHP
Seminar Room Seminar via zoom https://ijclab.zoom.us/j/94900481972
Speaker's Last Name Skordis
Speaker's First Name Constantinos
Speaker's Email Address
Speaker's Institution University of Cyprus and Czech Academy of Sciences
Title MOND day - New gravitational degrees of freedom as a solution to the dark matter problem
Abstract 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.
arXiv Preprint Number
Comments This seminar follows the one at 16:00 by David Spergel (Princeton University)
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