arXiv:2501.11619·v3·High Energy Physics — Phenomenology
Supercooled phase transitions in conformal dark sectors explain NANOGrav data
João Gonçalves🇵🇹 · Danny Marfatia🇺🇸 · António P. Morais🇵🇹 · Roman Pasechnik🇸🇪
Abstract
According to recent lore, it is difficult to explain the evidence for a stochastic gravitational wave background obtained by pulsar timing arrays with supercooled first-order phase transitions (FOPTs). We demonstrate that supercooled FOPTs in dark U(1)' models with a conformal dark sector easily explain the nHz signal at NANOGrav.
Comments: 6 pages, 5 figures, 1 table. Version to appear in PLB