Supercooled phase transitions in conformal dark sectors explain NANOGrav data

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.

6 pages, 5 figures, 1 table. Version to appear in PLB

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Cited by in corpus (4)

• Sub-GeV dark matter and nano-Hertz gravitational waves from a classically conformal dark sector
• Thermodynamical uncertainties for primordial black holes from cosmological phase transitions
• Primordial black holes and magnetic fields in conformal neutrino mass models
• Cosmic Overture Echoed in a Stellar Final Act: Implications of Nanohertz Gravitational Waves for Core Collapse Supernova Neutrinos