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

Understand

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, &#34;T_RH&#34;, with a weak-scale coupling to ordinary matter.