Dark-Matter Spontaneous Freeze Out - Archive ouverte HAL
Communication Dans Un Congrès Année : 2020

Dark-Matter Spontaneous Freeze Out

Hervé Partouche

Résumé

We consider the possibility that thermalized dark-matter particles acquire their mass thanks to the spontaneous breaking of a symmetry below some critical temperature. We describe the regime where a freeze out mechanism takes place shortly after the onset of the phase transition, while the dark-matter mass has not yet reached its final constant value. For such a “spontaneous freeze out” to yield the correct relic density, the present-time cross section of annihilation of the dark matter into Standard-Model states has to be one or two orders of magnitude larger than in the case of a constant dark-matter mass.

Dates et versions

hal-02542883 , version 1 (14-04-2020)

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Hervé Partouche. Dark-Matter Spontaneous Freeze Out. International Conference on Neutrinos and Dark Matter, Jan 2020, Hurghada, Egypt. ⟨hal-02542883⟩
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