Neutrino portal to FIMP dark matter with an early matter era

• DOI: 10.1007/jhep03(2021)026
• Publication Date: 2021-03-04T10:08:15Z
• Authors: Catarina Cosme; Maíra Dutra; Teng Ma; Yongcheng Wu; Litao Yang
• Keywords: Light dark matter

We study the freeze-in production of Feebly Interacting Massive Particle (FIMP) dark matter candidates through a neutrino portal. consider hidden sector comprised fermion and complex scalar, with lightest one regarded as FIMP candidate. implement Type-I Seesaw mechanism for generating masses Standard Model (SM) neutrinos three heavy neutrinos, responsible mediating interactions between SM sectors. assume that an early matter-dominated era (EMDE) took place some period inflation Big Bang Nucleosynthesis, making Universe to expand faster than in standard radiation-dominated era. In this case, sectors are easily decoupled larger couplings FIMPs particles needed from relic density constraints. context, we discuss dynamics throughout modified cosmic history, evaluate relevant constraints model consequences duration EMDE production. Finally, show if not part thermal bath, scenario becomes testable indirect detection searches.