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arXiv · 2207.05096

Hot and heavy dark matter from a weak scale phase transition

Iason Baldes·Yann Gouttenoire·Filippo Sala
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Abstract

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 $10^8 - 10^9$ GeV and energy scales of the PT around $10^{2} - 10^3$ 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-$\alpha$, 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.

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Iason Baldes, Yann Gouttenoire, Filippo Sala. 2022-07-11. Hot and heavy dark matter from a weak scale phase transition. https://doi.org/10.21468/scipostphys.14.3.033

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