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We study the possibility of generating dark matter (DM) purely fromultra-light primordial black hole (PBH) evaporation with the latter beingproduced from a first order phase transition (FOPT) in the early Universe. Ifsuch ultra-light PBH leads to an early matter domination, it can give rise to adoubly peaked gravitational wave (GW) spectrum in Hz-kHz ballpark with the lowfrequency peak generated from PBH density fluctuations being within near futureexperimental sensitivity. In the sub-dominant PBH regime, the FOPT generated GWspectrum comes within sensitivity due to absence of entropy dilution. In boththe regimes, PBH mass from a few kg can be probed by GW experiments like BBO,ET, CE, UDECIGO etc. while DM mass gets restricted to the superheavy ballparkin the PBH dominance case. Apart from distinct DM mass ranges in the twoscenarios, GW observations can differentiate by measuring their distinctspectral shapes.

Dark matter from phase transition generated PBH evaporation with gravitational waves signatures