Massive Gravitons as Feebly Interacting Dark Matter Candidates
Abstract
We detail our discovery of a chiral enhancement in the production cross sections of massive spin-2 gravitons, below the electroweak symmetry breaking scale, that makes them ideal dark matter candidates for the freeze-in mechanism. The result is independent of the physics at high scales and points toward masses in the keV-MeV range. The graviton is, therefore, a sub-MeV dark matter particle, as favored by the small scale galaxy structures. We apply the novel calculation to a Randall-Sundrum model with multiple branes, showing a significant parameter space where the first two massive gravitons saturate the dark matter relic density.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 2022
- DOI:
- 10.1103/PhysRevLett.128.081806
- arXiv:
- arXiv:2107.14548
- Bibcode:
- 2022PhRvL.128h1806C
- Keywords:
-
- High Energy Physics - Phenomenology
- E-Print:
- 6 pages plus appendix, 2 figures