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$Z^\prime$-mediated dark matter freeze-in at stronger coupling
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abstract
We study freeze-in production of fermionic dark matter mediated by a $Z^\prime$ gauge boson. In particular, we explore the regime of Boltzmann-suppressed production, when the Standard Model (SM) thermal bath temperature never exceeds the dark matter mass. The corresponding gauge coupling is then required to be significant, up to order one. As a result, this class of freeze-in models can be probed by the current and future direct dark matter detection experiments.
Forward citations
Cited by 2 Pith papers
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Hidden Sector Custodial Naturalness
A minimal SO(5) custodial naturalness model with two scalar singlets dynamically generates the electroweak scale and supplies a freeze-in dark matter candidate.
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Indirect dark matter searches with neutrino telescopes via energetic cosmic showers
Bounds on Z'-mediated dark matter are derived from neutrino telescopes, freeze-in, and cosmic strings, but the telescope bounds rest on comparing a Galactic-center flux to faraway sources.
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