Abstract
We describe a new mechanism of dark matter production. If dark matter particles acquire mass during a first order phase transition, it is energetically unfavorable for them to enter the expanding bubbles. Instead, most of them are reflected and quickly annihilate away. The bubbles eventually merge as the phase transition completes and only the dark matter particles that have entered the bubbles survive to constitute the observed dark matter today. This mechanism can produce dark matter with masses from the TeV scale to above the PeV scale, surpassing the Griest-Kamionkowski bound.
Highlights
We describe a new mechanism of dark matter production
If a dark matter (DM) particle is thermalized with the standard model (SM) plasma in the early Universe the cosmological expansion, which causes the plasma to cool adiabatically, will eventually make the DM’s interactions with the SM inefficient, driving it out of equilibrium
In this Letter, we propose a new mechanism for generating the DM relic abundance
Summary
If dark matter particles acquire mass during a first order phase transition, it is energetically unfavorable for them to enter the expanding bubbles. The bubbles eventually merge as the phase transition completes and only the dark matter particles that have entered the bubbles survive to constitute the observed dark matter today This mechanism can produce dark matter with masses from the TeV scale to above the PeV scale, surpassing the Griest-Kamionkowski bound. FOPTs proceed through the nucleation and growth of bubbles of the new hφi 1⁄4 viφn phase [44]. These bubbles expand and merge until the whole Universe has transitioned. We assume that hφi ≠ 0 generates a large mass for the DM particles, so light DM particles become heavy as they cross
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