Abstract
Particle production at the end of a first-order electroweak phase transition may be rather generic in theories beyond the standard model. Dark matter may then be abundantly produced by this mechanism if it has a sizable coupling to the Higgs field. For an electroweak phase transition occuring at a temperature T EW ~ 50–100 GeV, non- thermally generated dark matter with mass M X > TeV will survive thermalization after the phase transition, and could then potentially account for the observed dark matter relic density in scenarios where a thermal dark matter component is either too small or absent. Dark matter in these scenarios could then either be multi-TeV WIMPs whose relic abundace is mostly generated at the electroweak phase transition, or “Baby-Zillas” with mass M GUT ≫ M X ≫ \({v_{\mathrm{EW}}}\) that never reach thermal equilibrium in the early universe.
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Falkowski, A., No, J.M. Non-thermal dark matter production from the electroweak phase transition: multi-TeV WIMPs and “baby-zillas”. J. High Energ. Phys. 2013, 34 (2013). https://doi.org/10.1007/JHEP02(2013)034
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DOI: https://doi.org/10.1007/JHEP02(2013)034