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We propose a novel probe of weakly interacting massive particle (WIMP) darkmatter (DM) candidates of a wide mass range which fall short of the requiredannihilation rates to satisfy correct thermal relic abundance, dubbed as\textit{Miracle-less WIMP}. If the DM interactions are mediated by an Abeliangauge boson like B-L, its annihilation rates typically remain smaller than theWIMP ballpark for very high scale B-L symmetry breaking, leading tooverproduction. The thermally overproduced relic is brought within observedlimits via late entropy dilution from one of the three right handed neutrinos(RHN) present for keeping the model anomaly free and generating light neutrinomasses. Such late entropy injection leads to peculiar spectral shapes ofgravitational waves (GW) generated by cosmic strings, formed as a result of B-Lsymmetry breaking. We find interesting correlation between DM mass and turningfrequency of the GW spectrum with the latter being within reach of futureexperiments. The two other RHNs play major role in generating light neutrinomasses and baryon asymmetry of the universe via leptogenesis. Successfulleptogenesis with Miracle-less WIMP together restrict the turning frequenciesto lie within the sensitivity limits of near future GW experiments.

Probing Miracle-less WIMP Dark Matter via Gravitational Waves Spectral Shapes