Interplay of scalar and fermionic components in a multi-component dark matter scenario

Abstract

We explore the multi-component dark matter (DM) scenario considered in a simple extension of the standard model with an inert scalar doublet and a singlet fermionic field providing the two DM candidates. The DM states are made stable under the unbroken Z 2 × Z 2 discrete symmetry. An additional gauge singlet scalar field is introduced to facilitate the interaction of the dark fermion with the visible sector. Presence of a charged fermionic field having the same Z 2 charge as that of the inert scalar field allows exploring the dark matter mass regions otherwise disallowed, like in the standard Inert Doublet Model (IDM) scenarios. With these arrangements, it is shown that the light DM scenario and the desert region in the intermediate mass range of DM in the standard IDM case can be made compatible with the relic density bounds and direct detection limits. Further, detailed parameter space study is carried out keeping the coexistence of both the scalar and fermionic components in focus, showing that sizable parameter space regions are available for the entire mass range of 10 GeV ≤ M DM ≤

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.…”

Probing multicomponent extension of inert doublet model with a vector dark matter

“…Different multicomponent dark matter models including both thermal and non-thermal dark matter candidates have been explored in the Refs. [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58]. In multicomponent dark matter models one of the candidates shares a fraction of total DM relic abundance and the other candidate provides the required amount of relic density in order to satisfy the total DM relic density observed by Planck [2].…”

Connecting light dirac neutrinos to a multi-component dark matter scenario in gauged $$B-L$$ model

“…Such null results have not only motivated the studies of beyond thermal WIMP paradigm but also a richer DM sector consisting of multiple DM components. Some recent proposals for multi-component DM can be found in [60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94] and references therein. As several of these works pointed out, apart from having larger allowed region of parameter space due to freedom of tuning relative DM abundances, such multi-component DM scenarios often offer complementary probes at experiments spanning out to different frontiers.…”