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Is the NANOGrav signal a hint of dS decay during inflation?
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As suggested by the swampland conjectures, de Sitter (dS) space might be highly unstable if it exists at all. During inflation, the short-lived dS states will decay through a cascade of the first-order phase transition (PT). We find that the gravitational waves (GWs) yielded by such a PT will be "reddened" by subsequent dS expansion, which may result in a slightly red-tilt stochastic GWs background at low-frequency band, compatible with the NANOGrav 12.5-yr result.
Forward citations
Cited by 2 Pith papers
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Curvature perturbations from vacuum transition during inflation
Vacuum transitions during inflation, modulated by a light spectator field, can generate curvature perturbations with non-Gaussianity fNL ~ O(10) in a Higgs inflation setup.
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