Dark matter abundance from the sequential freeze-in mechanism

We present a thorough analysis of the sequential freeze-in mechanism for dark matter production in the early Universe. In this mechanism the dark matter relic density results from pair annihilation of mediator particles which are themselves produced by thermal collisions of standard model particles....

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Bibliographic Details
Published in:Physical review. D 2020-08, Vol.102 (3), p.1, Article 035017
Main Authors: Bélanger, Geneviève, Delaunay, Cédric, Pukhov, Alexander, Zaldivar, Bryan
Format: Article
Language:English
Subjects:
Collisions
Dark matter
Standard model (particle physics)
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Summary:We present a thorough analysis of the sequential freeze-in mechanism for dark matter production in the early Universe. In this mechanism the dark matter relic density results from pair annihilation of mediator particles which are themselves produced by thermal collisions of standard model particles. Below some critical value of the mediator coupling to standard model fields, this sequential channel dominates over the usual freeze-in where dark matter is directly produced from thermal collisions, even when the mediator is not in thermal equilibrium. The latter case requires computing the full nonthermal distribution of the mediators, for which finite temperature corrections are particularly important.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.102.035017