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 Milgroms 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 Milgroms 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) |
Attachments |
To Generate a poster for this seminar : [ Postscript | PDF ]
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