Evolution of Non-linear Fluctuations in Preheating after Inflation
Yasusada Nambu, Yohei Araki
TL;DR
This paper studies how non-linear fluctuations evolve during the preheating phase after inflation, revealing that large-scale fluctuation amplitudes are suppressed due to non-linear effects.
Contribution
It introduces a numerical approach using the separate universe method to analyze the non-linear evolution of fluctuations during preheating.
Findings
Large-scale fluctuation amplitudes are suppressed after non-linear evolution.
The separate universe approach effectively models the evolution of scalar field fluctuations.
Numerical results provide insights into the dynamics of preheating phases.
Abstract
We investigate the evolution of the non-linear long wavelength fluctuations during preheating after inflation. By using the separate universe approach, the temporal evolution of the power spectrum of the scalar fields and the curvature variable is obtained numerically. We found that the amplitude of the large scale fluctuations is suppressed after non-linear evolution during preheating.
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