Energy-momentum tensor and helicity for gauge fields coupled to a pseudoscalar inflaton

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Date

2019

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Journal ISSN

Volume Title

Publisher

University of the Western Cape

Abstract

We study the energy-momentum tensor and helicity of gauge fields coupled through $g \phi F \tilde{F}/4$ to a pseudo-scalar field $\phi$ driving inflation. Under the assumption of a constant time derivative of the background inflaton, we compute analitically divergent and finite terms of the energy density and helicity of gauge fields for any value of the coupling $g$. We introduce a suitable adiabatic expansion for mode functions of physical states of the gauge fields which correctly reproduces ultraviolet divergences in average quantities and identify corresponding counterterms. Our calculations shed light on the accuracy and the range of validity of approximated analytic estimates of the energy density and helicity terms previously existed in the literature in the strongly coupled regime only, i.e. for $g \dot \phi/(2H) \gg 1$. We discuss the implications of our analytic calculations for the backreaction of quantum fluctuations onto the inflaton evolution.

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Keywords

Helicity integral, adiabatic regularization method, ENERGY DENSITY, pseudoscalar inflaton, Energy-momentum tensor

Citation

Ballardini, Mario & Braglia, M. & Finelli, F. & Marozzi, G. & Starobinsky, Alexei. (2019). Energy-momentum tensor and helicity for gauge fields coupled to a pseudo-scalar inflation.