期刊
PHYSICAL REVIEW LETTERS
卷 128, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.081806
关键词
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资金
- National Research Foundation of Korea (NRF) - Korea government (MEST) [NRF-2021R1A2C1005615]
- Tsung-Dao Lee Institute, SJTU where this project is initiated
- Campus-France STAR project Higgs and dark matter connections
In this study, we present our discovery of a chiral enhancement in the production cross sections of massive spin-2 gravitons below the electroweak symmetry breaking scale, which makes them ideal dark matter candidates for the freeze-in mechanism. The result is independent of physics at high scales and points to graviton masses in the keV-MeV range, suggesting that gravitons could be sub-MeV dark matter particles, consistent with the preferred scale of small galaxy structures. We apply this novel calculation to a Randall-Sundrum model with multiple branes, demonstrating a significant parameter space where the first two massive gravitons saturate the dark matter relic density.
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.
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