Correlated gravitational wave and microlensing signals of macroscopic dark matter

Abstract

Fermion dark matter particles can aggregate to form extended dark matter structures via a first-order phase transition in which the particles get trapped in the false vacuum. We study Fermi balls created in a phase transition induced by a generic quartic thermal effective potential. We show that for Fermi balls of mass, $3\times 10^{-12}{M}_{\odot }\lesssim M_{\mathrm{FB}}\lesssim 10^{-5}{M}_{\odot }$, correlated observations of gravitational waves produced during the phase transition (at SKA/THEIA/$\mu$Ares), and gravitational microlensing caused by Fermi balls (at Subaru-HSC), can be made.

Comments: 16 pages, 7 figures, 1 table. Version to appear in JHEP