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Stellar-mass primordial black holes (PBHs) from the early Universe candirectly contribute to the gravitational wave (GW) events observed by LIGO, butcan only comprise a subdominant component of the dark matter (DM). The primaryDM constituent will generically form massive halos around seeding stellar-massPBHs. We demonstrate that gravitational lensing of sources at cosmological($\gtrsim$Gpc) distances can directly explore DM halo dresses engulfing PBHs,challenging for lensing of local sources in the vicinity of Milky Way. Stronglensing analysis of fast radio bursts detected by CHIME survey already startsto probe parameter space of dressed stellar-mass PBHs, and upcoming searchescan efficiently explore dressed PBHs over $\sim 10-10^5 M_{\odot}$ mass-rangeand provide a stringent test of the PBH scenario for the GW events. Ourfindings establish a general test for a broad class of DM models withstellar-mass PBHs, including those where QCD axions or WIMP-like particlescomprise predominant DM. The results open a new route for exploring dressedPBHs with various types of lensing events at cosmological distances, such assupernovae and caustic crossings.

Revealing Dark Matter Dress of Primordial Black Holes by Cosmological Lensing