Thermal Dark Matter Below an MeV

Abstract

We consider a class of models in which thermal dark matter is lighter than an MeV. If dark matter thermalizes with the Standard Model below the temperature of neutrino-photon decoupling, equilibration and freeze-out cools and heats the Standard Model bath comparably, alleviating constraints from measurements of the effective number of neutrino species. We demonstrate this mechanism in a model consisting of fermionic dark matter coupled to a light scalar mediator. Thermal dark matter can be as light as a few keV, while remaining compatible with existing cosmological and astrophysical observations. This framework motivates new experiments in the direct search for sub-MeV thermal dark matter and light force carriers.

5 pages, 4 figures; discussion and references added

References in corpus (12)

• Results from a search for dark matter in the complete LUX exposure
• Dark Matter Results from First 98.7-day Data of PandaX-II Experiment
• Sterile neutrinos in cosmology
• Resonant Dark Forces and Small Scale Structure
• BBN And The CMB Constrain Neutrino Coupled Light WIMPs
• Thermal Dark Matter From A Highly Decoupled Sector
• Light Dark Matter in Superfluid Helium: Detection with Multi-excitation Production
• Cosmological bounds on dark matter-neutrino interactions
• A tale of two modes: Neutrino free-streaming in the early universe
• Cosmological Constraints on Interacting Light Particles
• Supernova Constraints on Massive (Pseudo)Scalar Coupling to Neutrinos
• Probing small-scale cosmological fluctuations with the 21 cm forest: effects of neutrino mass, running spectral index and warm dark matter

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