Correlated signals of first-order phase transitions and primordial black hole evaporation

Abstract

A bstract Fermi balls produced in a cosmological first-order phase transition may collapse to primordial black holes (PBHs) if the fermion dark matter particles that comprise them interact via a sufficiently strong Yukawa force. We show that phase transitions described by a quartic thermal effective potential with vacuum energy, 0 . 1 ≲ B 1/4 /MeV ≲ 10 3 , generate PBHs of mass, 10 − 20 ≲ M PBH / M ⊙ ≲ 10 − 16 , and gravitational waves from the phase transition (at THEIA/ μ Ares) can be correlated with an isotropic extragalactic X-ray/ γ -ray background from PBH evaporation (at AMEGO-X/e-ASTROGAM).

Topics & Concepts