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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 6 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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Dark Matter Ultraviolet Freeze-in in General Reheating Scenarios
The paper derives analytic dark matter freeze-in yields for arbitrary power-law reheating histories and maps the gravitational production parameter space.
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Aspects of Gravitational Portals and Freeze-in during Reheating
During reheating, freeze-in from the gravitationally produced radiation bath can dominate the dark matter relic density for DM masses above the reheating temperature, with k- and n-dependent constraints.
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Probing low-reheating scenarios with minimal freeze-in dark matter
In the minimal freeze-in dark photon model, low-temperature reheating pushes the required portal coupling to larger values, and the exact curve depends on the equation of state during reheating, widening the reach of ...
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$Z'$-Mediated Dark Matter with Low-Temperature Reheating
Low-temperature reheating shifts the relic-density contours of Z'-mediated dark matter so that WIMP and FIMP solutions merge and new regions become testable.
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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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