Carleton University, Canada
We study the dark matter production by the freeze-in mechanism through the neutrino portal, in a scenario where the Universe undergoes an early-matter era at early times. This model considers a hidden sector comprised of a fermion and a complex scalar, with the lightest one regarded as a dark matter candidate. We implement the Type-I Seesaw mechanism for generating the masses of the Standard Model neutrinos and consider three heavy neutrinos, responsible for mediating the hidden and the Standard Model sectors. We assume that, for some period between inflation and the Big Bang Nucleosynthesis, the energy density of the Universe was dominated by some matter component, leading its evolution. In this talk, I will discuss the dynamics of the dark matter candidate throughout the modified cosmic history, evaluate the relevant constraints of the model and discuss the consequences of the duration of the early matter era for the dark matter production. Additionally, I will mention prospects for direct and indirect detection of such dark matter candidate.
2020 January 08, 14:30
Faculdade de CiÍncias da Universidade de Lisboa (C8.2.10)