Non-Gaussianity and the induced gravitational wave background. Issue 10 (27th October 2021)

• Record Type: Journal Article
• Authors: Adshead, Peter; Lozanov, Kaloian D.; Weiner, Zachary J.
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2021:Issue 10(2021)
• Publication Date: 2021-10-27
• Subjects: cosmological perturbation theory -- gravitational waves / sources -- gravitational waves / theory -- primordial black holes; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2021/10/080
• Languages: English
• ISSNs: 1475-7516

Abstract

Abstract: Scalar metric fluctuations generically source a spectrum of gravitational waves at second order in perturbation theory, poising gravitational wave experiments as potentially powerful probes of the small-scale curvature power spectrum. We perform a detailed study of the imprint of primordial non-Gaussianity on these induced gravitational waves, emphasizing the role of both the disconnected and connected components of the primoridal trispectrum. Specializing to local-type non-Gaussianity, we numerically compute all contributions and present results for a variety of enhanced primordial curvature power spectra.