Author:
Peloso Marco,Sorbo Lorenzo
Abstract
Abstract
We perform an analytical study of the stability of the background
solution [1] of the model in which an inflaton, through an axionic coupling to a
U(1) gauge field, causes an amplification of the gauge field modes that strongly backreact on
its dynamics. To this goal, we study the evolution of the gauge field modes coupled to the
inflaton zero mode, treating perturbatively the deviation of the inflaton velocity from its
mean-field value. As long as the system is in the strong backreaction regime we find that the
inflaton velocity performs oscillations of increasing amplitude about the value it would have in
the approximation of constant velocity, confirming an instability that has been observed in
numerical studies.
Subject
Astronomy and Astrophysics
Cited by
16 articles.
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