A new mechanism to enhance primordial tensor fluctuations in single field inflation

Mylova, Maria, Ozsoy, Ogan, Parameswaran, Susha, Tasinato, Gianmassimo and Zavala, Ivonne (2018) A new mechanism to enhance primordial tensor fluctuations in single field inflation. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2018 (12). 024-024.

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Official URL: http://dx.doi.org/10.1088/1475-7516/2018/12/024

Abstract

We discuss a new mechanism to enhance the spectrum of primordial tensor fluctuations in single field inflationary scenarios. The enhancement relies on a transitory non-attractor inflationary phase, which amplifies the would-be decaying tensor mode, and gives rise to a growth of tensor fluctuations at superhorizon scales. We show that the enhancement produced during this phase can be neatly treated via a tensor duality between an attractor and non-attractor phase, which we introduce. We illustrate the mechanism and duality in a kinetically driven scenario of inflation, with non-minimal couplings between the scalar and the metric.

Item Type:	Article
Uncontrolled Keywords:	cosmological perturbation theory, gravitational waves / theory, inflation
Depositing User:	Symplectic Admin
Date Deposited:	05 Apr 2019 07:41
Last Modified:	19 Jan 2023 00:55
DOI:	10.1088/1475-7516/2018/12/024
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3035864