arXiv:2009.10327·v2·High Energy Physics — Phenomenology
NANOGrav results and Dark First Order Phase Transitions
Andrea Addazi🇨🇳 · Yi-Fu Cai🇨🇳 · Qingyu Gan🇨🇳 · Antonino Marciano🇨🇳 · Kaiqiang Zeng🇨🇳
Abstract
The recent NANOGrav evidence of a common-source stochastic background provides a hint to Gravitational Waves (GW) radiation from the Early Universe. We show that this result can be interpreted as a GW spectrum produced from First Order Phase Transitions (FOPTs) around a temperature in the KeV-MeV window. Such a class of FOPTs at temperatures much below the electroweak scale can be naturally envisaged in several Warm Dark Matter models such as Majoron Dark Matter.
Comments: More details and results on possible WDM-inspired GW spectra added, including more recent numerical tools in the subject. New references added. The main conclusions are substantially unchanged