We construct a single-field model of inflation that achieves remarkable agreement with Planck and BICEP/Keck cosmological observations. The model, via the presence of an ultraslow-roll phase, generates a sizable scalar-induced gravitational wave (GW) signal at nHz frequencies. We elucidate the distinctive features of this signal concerning its connection to the recent measurement of the low-frequency GW background reported by the NANOGrav collaboration.
Inflationary interpretation of the nHz gravitational-wave background / Frosina, Lorenzo; Urbano, Alfredo. - In: PHYSICAL REVIEW D. - ISSN 2470-0029. - 108:10(2023). [10.1103/PhysRevD.108.103544]
Inflationary interpretation of the nHz gravitational-wave background
Lorenzo Frosina;Alfredo Urbano
2023
Abstract
We construct a single-field model of inflation that achieves remarkable agreement with Planck and BICEP/Keck cosmological observations. The model, via the presence of an ultraslow-roll phase, generates a sizable scalar-induced gravitational wave (GW) signal at nHz frequencies. We elucidate the distinctive features of this signal concerning its connection to the recent measurement of the low-frequency GW background reported by the NANOGrav collaboration.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
