Modifying dark matter indirect detection signals by thermal effects at freeze-out

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.

8 pages, 5 figures, version accepted by the PRD

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• Two-step strongly first-order electroweak phase transition modified FIMP dark matter, gravitational wave signals, and the neutrino mass
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• Variations on the Vev Flip-Flop: Instantaneous Freeze-out and Decaying Dark Matter
• Sensitivity to Dark Sector Scales from Gravitational Wave Signatures
• FIMP dark matter mediated by massive gauge boson around the phase transition period and the gravitational waves production
• Dark matter transient annihilations in the early Universe