A conformal dark U(1)' sector undergoing a strongly supercooled first-order phase transition can fit the NANOGrav 15-year gravitational wave background.
(15) ∗ Electronic address: jpedropino@ua.pt † Electronic address: dmarf8@hawaii.edu ‡ Electronic address: amorais@fisica.uminho.pt § Electronic address: Roman.Pasechnik@fysik.lu.se
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Supercooled phase transitions in conformal dark sectors explain NANOGrav data
A conformal dark U(1)' sector undergoing a strongly supercooled first-order phase transition can fit the NANOGrav 15-year gravitational wave background.