Disentangling the primordial nature of stochastic gravitational wave backgrounds with CMB spectral distortions

Publication
Author

Bryce Cyr, Tom Kite, Jens Chluba, J. Colin Hill, Donghui Jeong, Sandeep Kumar Acharya, Boris Bolliet and Subodh P. Patil

Published

September 5, 2023

In this paper we demonstrate the unique ability of spectral distortion (SD) measurements to disentangle the primordial nature of a stochastic gravitational wave background (SGWB) from its possible astrophysical foreground. We show this not through the SD induced from SGWB, but rather the limits that SD can place on the primordial power spectrum istelf, which in turn limits the formation of SWGB thorugh a variety of mechanisms. We show the potential of SD measurements applied to some concrete scenarios, like secondary induced gravitational waves (SIGW) and blackhole formation.

Arxiv preprint

An extended look at the gravitational wave parameter space for SIGWs from a 𝛿-function feature in the PPS An extended look at the gravitational wave parameter space for SIGWs from a 𝛿-function feature in the PPS