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

Neutrino Portal to FIMP Dark Matter with an Early Matter Era