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arXiv · 1306.4677

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

Xiaoyong Chu·Yann Mambrini·Jérémie Quevillon·Bryan Zaldivar
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Abstract

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.

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Xiaoyong Chu, Yann Mambrini, Jérémie Quevillon, Bryan Zaldivar. 2014-01-27. Thermal and non-thermal production of dark matter via Z'-portal(s). https://doi.org/10.1088/1475-7516%2F2014%2F01%2F034

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