Abstract
We present an extension of the Standard Model, containing a fermion dark matter candidate and two real scalar singlets, where the observed dark matter abundance is produced via freeze-out before the electroweak phase transition. We show that in this case the dark matter annihilation channels determining its freeze-out are different from those producing indirect detection signal. We present a benchmark model where the indirect annihilation cross-section differs from the freeze-out one. The model also has a gravitational wave signature due to the first order electroweak phase transition.
Highlights
The existence of dark matter (DM) is among the few indications of physics beyond the standard model (SM)
In the feebly interacting massive particle (FIMP) scenario (e.g., [28]), if the DM abundance is determined by freeze-out in a hidden sector, one can obtain an indirect detection cross section very different from the usual weakly interacting massive particles (WIMPs) case, because the hidden sector temperature
We present a scenario where the DM freeze-out occurs before the electroweak phase transition (EWPT)
Summary
The existence of dark matter (DM) is among the few indications of physics beyond the standard model (SM). Many popular models of weakly interacting massive particles (WIMPs) have come under pressure [1], as the bounds from direct detection, e.g., the LUX [2], PandaX [3], and XENON1T [4] detectors, are getting very stringent While these constraints can be evaded, e.g., by “secluded” WIMPs [5,6], semiannihilation [7,8,9,10,11,12,13,14,15,16], or a pseudoscalar mediators [17,18,19,20,21], usually, for WIMPs, the same processes that determine DM freeze-out cause an indirect detection signal. The nonzero singlet VEVopens efficient DM annihilation channels that yield the observed DM relic density, but which are closed in the EW-breaking minimum This separates the DM annihilation processes, which determine its freeze-out, from the indirect detection signal, corresponding to the DM.
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