Robustness of inflation to kinetic inhomogeneities

Robustness of inflation to kinetic inhomogeneities

We investigate the effects of large inhomogeneities in both the inflaton field and its momentum. We find that in general, large kinetic perturbations reduce the number of e-folds of inflation. In particular, we observe that inflationary models with sub-Planckian characteristic scales are not robust...

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Hauptverfasser: Elley, Matthew, Aurrekoetxea, Josu C, Clough, Katy, Flauger, Raphael, Giannadakis, Panagiotis, Lim, Eugene A
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Physics - Cosmology and Nongalactic Astrophysics
Physics - General Relativity and Quantum Cosmology
Physics - High Energy Physics - Theory
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creator Elley, Matthew
Aurrekoetxea, Josu C
Clough, Katy
Flauger, Raphael
Giannadakis, Panagiotis
Lim, Eugene A
description We investigate the effects of large inhomogeneities in both the inflaton field and its momentum. We find that in general, large kinetic perturbations reduce the number of e-folds of inflation. In particular, we observe that inflationary models with sub-Planckian characteristic scales are not robust even to kinetic energy densities that are sub-dominant to the potential energy density, unless the initial field configuration is sufficiently far from the minimum. This strengthens the results of our previous work. In inflationary models with super-Planckian characteristic scales, despite a reduction in the number of e-folds, inflation is robust even when the potential energy density is initially sub-dominant. For the cases we study, the robustness of inflation strongly depends on whether the inflaton field is driven into the reheating phase by the inhomogeneous scalar dynamics.
doi_str_mv 10.48550/arxiv.2405.03490
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Physics - General Relativity and Quantum Cosmology
Physics - High Energy Physics - Theory
title Robustness of inflation to kinetic inhomogeneities
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