From WIMPs to FIMPs : impact of early matter domination

• Autores: Silva Malpartida, Javier, Bernal, Nicolás, Jones-Pérez, Joel, Lineros, Roberto A.
• Formato: artículo
• Fecha de Publicación: 2025
• Institución: Pontificia Universidad Católica del Perú
• Repositorio: PUCP-Institucional
• Lenguaje: inglés
• OAI Identifier: oai:repositorio.pucp.edu.pe:20.500.14657/203928
• Enlace del recurso: http://hdl.handle.net/20.500.14657/203928; https://doi.org/10.1088/1475-7516/2025/03/003
• Nivel de acceso: acceso abierto
• Materia: Cosmología; Materia oscura (Astronomía); Partículas; https://purl.org/pe-repo/ocde/ford#1.03.00

In the context of non-standard cosmologies, an early matter-dominated (EMD) era can significantly alter the conventional dark matter (DM) genesis. In this work, we reexamine the impact 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 Hubble expansion rate and the injection of entropy. The WIMP paradigm can be realized with couplings much smaller than in the standard cosmological scenario, whereas much larger couplings are required in the FIMP case. Using the singlet-scalar DM model as a case study, we show that these results can lead to a continuous transition between the WIMP and FIMP scenarios, with results that are also applicable to other DM models. This broadens the parameter space consistent with observed DM levels and suggests that even elusive FIMP scenarios may be within the reach of future experimental searches.