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Article Dans Une Revue Journal of Cosmology and Astroparticle Physics Année : 2014

Thermal and non-thermal production of dark matter via Z′-portal(s)

Résumé

We study the genesis of dark matter in the primordial Universe for representative classes of Z'-portals models. For weak-scale Z' mediators we compute the range of values of the kinetic mixing allowed by WMAP/PLANCK experiments corresponding to a FIMP regime. We show that very small values of the kinetic coupling (1.e-12 < delta < 1.e-11) are sufficient to produce the right amount of dark matter. We also analyse the case of very massive gauge mediators, whose mass is larger than the reheating temperature, "T_RH", with a weak-scale coupling to ordinary matter. Relic abundance constraints then impose a direct correlation between T_RH and the effective scale "Lambda" of the interactions: Lambda ~ 1.e3--1.e5 * T_RH. Finally we describe in some detail the process of dark thermalisation and study its consequences on the computation of the relic abundance.

Dates et versions

hal-02105411 , version 1 (21-04-2019)

Identifiants

Citer

Xiaoyong Chu, Y. Mambrini, Jeremie Quevillon, Bryan Zaldivar. Thermal and non-thermal production of dark matter via Z′-portal(s). Journal of Cosmology and Astroparticle Physics, 2014, 2014 (01), pp.034-034. ⟨10.1088/1475-7516/2014/01/034⟩. ⟨hal-02105411⟩
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