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Catastrogenesis with unstable ALPs as the origin of the NANOGrav 15 yr gravitational wave signal
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In post-inflation axion-like particle (ALP) models, a stable domain wall network forms if the model's potential has multiple minima. This system must annihilate before dominating the Universe's energy density, producing ALPs and gravitational waves (a process we dub "catastrogenesis," or "creation via annihilation"). We examine the possibility that the gravitational wave background recently reported by NANOGrav is due to catastrogenesis. For the case of ALP decay into two photons, we identify the region of ALP mass and coupling, just outside current limits, compatible with the NANOGrav signal.
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Cited by 2 Pith papers
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The power of SKA to Constrain cosmological gravitational-wave backgrounds below the astrophysical foreground noise
Cosmological gravitational wave backgrounds from phase transitions, domain walls, and condensate fragmentation are capped far below the astrophysical foreground by requiring that compact dark matter subhalos, which SK...
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NANOGrav 15-year gravitational-wave signals from binary supermassive black-holes seeded by primordial black holes, and implications for the origins of Little Red Dots
A PBH abundance of 10^-14–10^-12 of CDM, with seed masses 1–10^3 M_sun, is fitted to the NANOGrav 15-year background via SMBH mergers, consistent with 21-cm limits.
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