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Motivated by the recent release of new results from five different pulsartiming array (PTA) experiments claiming to have found compelling evidence forprimordial gravitational waves (GW) at nano-Hz frequencies, we consider theprospects of generating such a signal from inflationary blue-tilted tensorpower spectrum in a specific dark matter (DM) scenario dubbed as\textit{Miracle-less WIMP}. While \textit{Miracle-less WIMP}, due toinsufficient interaction rate with the standard bath gets thermallyoverproduced, inflationary blue-tilted gravitational waves (BGW) leads toconflict with cosmological observations if solely responsible for the PTAevents. Both these problems are circumvented with late entropy dilutionbringing DM abundance within limits while creating a doubly peaked feature ofBGW. The blue-tilted part of one of these peaks can fit NANOGrav 15 yr data at$1\sigma$ level. The particle physics setup used here for illustration namely,the gauged $U(1)_{B-L}$ model, naturally leads to \textit{Miracle-less WIMP}and long-lived diluter for entropy dilution while also having GWcomplementarity due to cosmic strings.

Inflationary origin of gravitational waves with \textit{Miracle-less WIMP} dark matter in the light of recent PTA results