Squeezed tensor non-Gaussianity in non-attractor inflation

Özsoy, Ogan, Mylova, Maria, Parameswaran, Susha, Powell, Cari, Tasinato, Gianmassimo and Zavala, Ivonne (2019) Squeezed tensor non-Gaussianity in non-attractor inflation. Journal of Cosmology and Astroparticle Physics, 2019 (09). 036-036.

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Official URL: http://dx.doi.org/10.1088/1475-7516/2019/09/036

Abstract

We investigate primordial tensor non-Gaussianity in single field ination, during a phase of non-attractor evolution when the spectrum of primordial tensor modes can be enhanced to a level detectable at interferometer scales. Making use of a tensor duality we introduced in [1], we analytically compute the full bispectrum of primordial tensor uctuations during the non-attractor era. During this epoch the shape of the tensor bispectrum is enhanced in the squeezed limit, its amplitude can be amplified with respect to slow-roll models, and tensor non-Gaussianity can exhibit a scale dependence distinctive of our set-up. We prove that our results do not depend on the frame used for the calculations. Squeezed tensor non-Gaussianity induces a characteristic quadrupolar anisotropy on the power spectrum of the stochastic background of primordial tensor perturbations. As a step to make contact with gravitational wave experiments, we discuss the response function of a ground based Michelson interferometer to a gravitational wave background with such a feature.

Item Type:	Article
Uncontrolled Keywords:	cosmological perturbation theory, gravitational waves / theory, inflation, physics of the early universe
Depositing User:	Symplectic Admin
Date Deposited:	16 Dec 2019 10:21
Last Modified:	19 Jan 2023 00:12
DOI:	10.1088/1475-7516/2019/09/036
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3066610