On the Tremaine-Gunn Limit with Mass-Varying Particles

Abstract

General classical arguments on the time evolution of the phase-space density can be used to derive constraints on the mass of particle candidates for the cosmological dark matter (DM). The resulting Tremaine-Gunn limit is extremely useful in constraining particle DM models. In certain models, however, the DM particle mass varies appreciably over time. In this work, we generalize the phase-space limits on possible DM particle masses to these scenarios. We then examine the ensuing cosmological implications on the effective DM equation of state and indirect DM detection.

RevTeX, 7 pages, 3 figures. Matches published version in PRD

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Cited by in corpus (1)

• $keV$ sterile neutrino as dark matter in doublet left-right symmetric model with $A_4$ modular symmetry