A Two-Component Dark Matter Model and its Associated Gravitational Waves

Abstract

We consider an extension of the Standard Model that accounts for the muon g − 2 tension and neutrino masses and study in detail dark matter phenomenology. The model under consideration includes a WIMP and a FIMP scalar dark matter candidates and thus gives rise to two-component dark matter scenarios. We discuss different regimes and mechanisms of production, including the novel freeze-in semi-production, and show that the WIMP and FIMP together compose the observed relic density today. The presence of the extra scalar fields allows phase transitions of the first order. We examine the evolution of the vacuum state and discuss stochastic gravitational wave signals associated with the first-order phase transition. We show that the gravitational wave signals may be probed by future gravitational wave experiments which may serve as a complementary detection signal.

Scalar-mediated dark matter model at colliders and gravitational wave detectors -- A White paper for Snowmass 2021

“…In addition, DM itself as scalar can also be possible to show its relevance at colliders and GW probes. In this aspect, single scalar DM model has been extensively studied already [55][56][57][58][59][60], while higher multiplets scalar DM is less studied and worth probing.…”

Gravitational wave signatures of a chiral fermion dark matter model

“…In this case, the dark sector could be accessible through gravitational wave signatures. GW signals arising from dark sector phase transition with gauge symmetry assumed to be U(1) [58][59][60][61][62][63][64][65][66][67][68][69], SU(2) [70][71][72][73], and SU(3) [74,75] have been examined and model agnostic analyses were carried out in refs. [76,77].…”