Relativistic Freeze-in

Abstract

We study production of scalar dark matter via the freeze--in mechanism in the relativistic regime, focussing on the simplest Higgs portal model. We derive the corresponding relativistic reaction rates based on the Bose--Einstein statistics taking into account the thermal mass effects as well as the change in the Higgs degrees of freedom at the electroweak phase transition. The consequent constraints on the Higgs portal coupling are obtained.

10+1 pages, 2 figures

References in corpus (2)

• Gauge Singlet Scalars as Cold Dark Matter
• The Dawn of FIMP Dark Matter: A Review of Models and Constraints

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