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# Boosted dark matter from primordial black holes produced in a first-order phase transition

Dec 2022

During a cosmological first-order phase transition in a dark sector, fermiondark matter particles $\chi$ can form macroscopic Fermi balls that collapse toprimordial blacholes (PBHs) under certain conditions. The evaporation of thePBHs produces a boosted $\chi$ flux, which may be detectable if $\chi$ couplesto visible matter. We consider the interaction of $\chi$ with electrons, andcalculate signals of the dark matter flux in the XENON1T, XENONnT,Super-Kamiokande and Hyper-Kamiokande experiments. A correlated gravitationalwave signal from the phase transition can be observed at THEIA and $\mu$Ares.An amount of dark radiation measurable by CMB-S4 is an epiphenomenon of thephase transition.

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