NANOGrav results and Dark First Order Phase Transitions
High Energy Physics - Phenomenology
2021-09-21 v2 General Relativity and Quantum Cosmology
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.
Keywords
Cite
@article{arxiv.2009.10327,
title = {NANOGrav results and Dark First Order Phase Transitions},
author = {Andrea Addazi and Yi-Fu Cai and Qingyu Gan and Antonino Marciano and Kaiqiang Zeng},
journal= {arXiv preprint arXiv:2009.10327},
year = {2021}
}
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