Hot and heavy dark matter from a weak scale phase transition

We point out that dark matter which is produced non-adiabatically in a phase transition (PT) with fast bubble walls receives a boost in velocity which leads to long free-streaming lengths. We find that this could be observed via the suppressed matter power spectrum for dark matter masses around \mat...

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Bibliographic Details
Published inSciPost physics Vol. 14; no. 3; p. 033
Main Authors Baldes, Iason, Gouttenoire, Yann, Sala, Filippo
Format Journal Article
LanguageEnglish
Published SciPost 01.03.2023
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Summary:We point out that dark matter which is produced non-adiabatically in a phase transition (PT) with fast bubble walls receives a boost in velocity which leads to long free-streaming lengths. We find that this could be observed via the suppressed matter power spectrum for dark matter masses around \mathbf{ 10^8 - 10^9} 10 8 - 10 9 GeV and energy scales of the PT around \mathbf{ 10^{2} - 10^3} 10 2 - 10 3 GeV. The PT should take place at the border of the supercooled regime, i.e. approximately when the Universe becomes vacuum dominated. This work offers novel physics goals for galaxy surveys, Lyman- \alpha ɑ , stellar stream, lensing, and 21-cm observations, and connects these to the gravitational waves from such phase transitions, and more speculatively to possible telescope signals of heavy dark matter decay.
ISSN:2542-4653
2542-4653
DOI:10.21468/SciPostPhys.14.3.033