Non-Gaussianity and the induced gravitational wave background

By Peter Adshead, K. Lozanov, Z. Weiner. Journal of Cosmology and Astroparticle Physics, 2021

139 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/31cbc1f402a7970fc4f53e8fb2ffa54dd8f879aa