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On the Tremaine-Gunn Limit with Mass-Varying Particles

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arxiv 2302.10246 v2 pith:3PK2DDWE submitted 2023-02-20 astro-ph.CO hep-phhep-th

On the Tremaine-Gunn Limit with Mass-Varying Particles

classification astro-ph.CO hep-phhep-th
keywords particlecosmologicallimitmassmodelsphase-spacetimetremaine-gunn
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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