Inhomogeneity and the Post-Inflationary Universe
Richard Easther, Matthew Parry (Brown U)
TL;DR
This paper investigates how non-linear gravitational effects influence the preheating phase after inflation by numerically solving Einstein's equations, assessing the limitations of perturbative approaches in this context.
Contribution
It provides a numerical analysis of non-linear gravitational effects during preheating, highlighting their significance and evaluating the accuracy of perturbative methods.
Findings
Non-linear effects can significantly alter preheating dynamics.
Perturbative methods may underestimate gravitational interactions during preheating.
Numerical solutions reveal complex inhomogeneities affecting post-inflationary evolution.
Abstract
We discuss the interaction between perturbations in the inflaton and the background during the preheating phase in simple inflationary models. By numerically solving the Einstein field equations we are able to assess the impact of non-linear gravitational effects on preheating, and to assess the accuracy of perturbative discussions of the preheating epoch.
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