Probing WIMP dark matter via gravitational waves’ spectral shapes

We propose a novel probe of weakly interacting massive particle (WIMP) dark matter (DM) candidates wide mass range which fall short the required annihilation rates to satisfy correct thermal relic abundance, dubbed as miracle-less WIMP. If DM interactions are mediated by an Abelian gauge boson like B-L, its typically remain smaller than WIMP ballpark for very high scale B-L symmetry breaking, leading overproduction. The thermally overproduced is brought within observed limits via late entropy dilution from one three right-handed neutrinos (RHN) present keeping model anomaly free and generating light neutrino masses. Such injection leads peculiar spectral shapes gravitational waves (GWs) generated cosmic strings, formed result breaking. find interesting correlation between turning frequency GW spectrum with latter being reach future experiments. two other RHNs play major role in masses baryon asymmetry universe leptogenesis. Successful leptogenesis together restrict frequencies lie sensitivity near