NANOGrav results and dark first order phase transitions

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作者：
Andrea Addazi
Yi-Fu Cai
Qingyu Gan
Antonino Marciano
Kaiqiang Zeng
机构：
[1] Sichuan University,Center for Theoretical Physics, College of Physics
[2] Istituto Nazionale di Fisica Nucleare,Department of Astronomy, School of Physical Sciences
[3] sezione Roma Tor Vergata,Chinese Academy of Sciences, Key Laboratory for Researches in Galaxies and Cosmology
[4] University of Science and Technology of China,School of Astronomy and Space Science
[5] University of Science and Technology of China,Department of Physics & Center for Field Theory and Particle Physics
[6] University of Science and Technology of China,Laboratori Nazionali di Frascati
[7] Fudan University,undefined
[8] Istituto Nazionale di Fisica Nucleare,undefined
来源：
Science China Physics, Mechanics & Astronomy | 2021年 / 64卷
关键词：
gravitational waves; first order phase transitions; warm dark matter; effective field theory; 04.30.-w; 11.15.Ex; 14.60.St; 98.80.-k;
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中图分类号：
学科分类号：
摘要：
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.
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