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Sterile Neutrino Dark Matter from Freeze-In
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A sterile neutrino is a well-motivated and widely studied dark matter candidate. The most straightforward realization of sterile neutrino dark matter, through the Dodelson-Widrow mechanism, is now ruled out by a combination of X-ray and Lyman-\alpha measurements. An alternative production mechanism that is becoming increasingly popular in the literature is the freeze-in mechanism, involving frameworks where a feeble coupling to a particle - usually a scalar beyond the Standard Model - in the thermal bath results in a gradual accumulation of the sterile neutrino dark matter abundance. This article reviews the various motivations for realizing such frameworks in the literature, their common characteristic features, and phenomenological signatures.
Forward citations
Cited by 3 Pith papers
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Photonic Freeze-In
Dark matter can be produced by photon annihilation through a loop-generated F² operator, a new photonic freeze-in scenario that is testable at low reheat temperatures.
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Inflaton decays during reheating can produce all of the observed sterile-neutrino dark matter with a branching ratio below 10^-4, evading X-ray bounds and making a future X-ray line a probe of the inflaton mass and re...
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Cosmic Colliders: High Energy Physics with First-Order Phase Transitions
Cosmic bubble collisions in runaway first-order phase transitions can, if the runaway regime holds, produce particles with masses far above the transition scale and energies approaching the Planck scale.
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