In the context of non-standard cosmologies, an early matter-dominated (EMD) era cansignificantly alter the conventional dark matter (DM) genesis. In this work, we reexamine theimpact of an EMD on the weakly- and feebly-interacting massive particle (WIMP and FIMP)paradigms. EMD eras significantly modify the genesis of DM because of the change in the Hubbleexpansion rate and the injection of entropy. The WIMP paradigm can be realized with couplings muchsmaller than in the standard cosmological scenario, whereas much larger couplings are required inthe FIMP case. Using the singlet-scalar DM model as a case study, we show that these results canlead to a continuous transition between the WIMP and FIMP scenarios, with results that are alsoapplicable to other DM models. This broadens the parameter space consistent with observed DMlevels and suggests that even elusive FIMP scenarios may be within the reach of future experimental searches.
Autor(es):BERNAL, Nicolás
JONES-PEREZ, Joel
LINEROS, Roberto
SILVA-MALPARTIDA, Javier
Año: 2025
Título de la revista: JCAP
Volumen: 03
Número: 003
Url: https://iopscience.iop.org/article/10.1088/1475-7516/2025/03/003