Boosted self-interacting dark matter in a multi-component dark matter model

Abstract

In models of multi-component dark matter, the lighter component of dark matter can be boosted by annihilations of the heavier state if mass splitting is large enough. Such relativistic dark matter can be detectable via large neutrino detectors such as Super-Kamiokande and IceCube. Moreover, if the process is inelastic scattering and decay length of the produced particle is short enough, another signature coming from the decay can also be detectable. In this paper, we construct a simple twocomponent dark matter model with a hidden U (1) D gauge symmetry where the lighter component of dark matter has a potential to improve the so-called small scale structure problems with large self-interacting cross section. We estimate number of multi-Cherenkov ring events due to both of the boosted dark matter and subsequent decay of the particle produced by inelastic scattering at Hyper-Kamiokande future experiment. Some relevant constraints, such as dark matter direct detection and cosmological observations, are also taken into account. The numerical analysis shows that some parameter space which can induce large self-interacting cross section can give a few multi-Cherenkov ring events per year at Hyper-Kamiokande.

Two component dark matter with inert Higgs doublet: neutrino mass, high scale validity and collider searches

“…Non observation of DM in direct search experiments like LUX [25], XENON 1T [25][26][27], Panda X [28] put a stringent bound on this model (with mass below 1 TeV getting disallowed) due to its prediction of large spin independent (SI) direct search cross section. As an alternative, multi-component DM scenarios [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] are proposed where DM-DM interactions (see for example, [39,40]) play an important role to evade direct search bound.Such an attempt was made in [39], where two singlet scalars serve as two DM components, that satisfy required DM constraints. However, the framework is unable to accommodate the low mass region corresponding to both the DM's masses, simultaneously below 500 GeV, to satisfy DM direct search bounds.…”

Optimizing energetic light dark matter searches in dark matter and neutrino experiments

“…We note that there are several ways to create relativistic (or at least fast-moving) dark matter particles in the universe: for example, two-component dark matter scenario [25,26,47,48], models with a Z 3 symmetry which may induce semi-annihilation processes [49], models involving anti-baryon-numbered dark matter-induced nucleon decays inside the sun [50], scenarios with decaying super-heavy particles [29,30,51], or energetic cosmic-ray induced (semi-)relativistic dark matter scenarios [52][53][54]. One can also think of various places from which boosted dark matter dominantly comes.…”

Natural axion model from flavour

“…Hence the only requirement for the axion in our model being cold DM is to have a mass m DM a ≤ 10 −2 eV in order to fall in the range of any of the allowed scenarios. However, note that having multi-component DM is also a viable possibility [64][65][66][67][68][69][70][71][72][73][74] and the axion could be responsible for only a fraction of the DM density, thus relaxing the constraints. For more details on axion DM we refer the reader to [63].…”