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A two-component vector WIMP -- fermion FIMP dark matter model with an extended seesaw mechanism

Francesco CostaSarif KhanJinsu Kim
Sep 2022
摘要
We consider an extension of the Standard Model that explains the neutrinomasses and has a rich dark matter phenomenology. The model has two dark mattercandidates, a vector WIMP and a fermion FIMP, and the sum of their relicdensities matches the total dark matter abundance. We extensively study thedark matter production mechanisms and its connection with the neutrino sector,together with various bounds from present and future experiments. The extrascalar field in the model may induce a first-order phase transition in theearly Universe. We study the production of stochastic gravitational wavesassociated with the first-order phase transition. We show that the phasetransition can be strong, and thus the model may satisfy one of the necessaryconditions for a successful electroweak baryogenesis. Detectability of thephase transition-associated gravitational waves is also discussed.
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