Supercooled phase transitions in conformal dark sectors explain NANOGrav data (2501.11619v2)

Published 20 Jan 2025 in hep-ph, astro-ph.CO, and hep-ex

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.

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