In a two-component dark matter model, a first-order phase transition can produce Fermi-balls and gravitational waves, with Fermi-balls potentially contributing up to about 30% of the dark matter relic density.
Multi-Component Dark Matter in a Non-Abelian Dark Sector
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abstract
In this paper, we explore a dark sector scenario with a gauged $SU(2)_R$ and a global $U(1)_X \times \mathbb{Z}_2$, where the continuous symmetries are spontaneously broken to a global $U(1)_D$. We show that in various regions of the parameter space we can have two, or three dark matter candidates, where these dark matter particles are either a Dirac fermion, a dark gauge boson, or a complex scalar. The phenomenological implications of this scenario are vast and interesting. We identify the parameter space that is still viable after taking into account the constraints from various experiments. We, also, discuss how this scenario can explain the recent observation by DAMPE in the electron-positron spectrum. Furthermore, we comment on the neutrino mass generation through non-renormalizable interactions between the standard model and the dark sector.
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Fermi-ball in a multicomponent dark matter framework and its gravitational wave signatures
In a two-component dark matter model, a first-order phase transition can produce Fermi-balls and gravitational waves, with Fermi-balls potentially contributing up to about 30% of the dark matter relic density.