Aspects of wave turbulence in preheating III: The case of the two-fields models

TL;DR

This paper investigates wave turbulence phenomena during preheating in two-field inflationary models, analyzing power spectra and thermalization, extending previous single-field studies.

Contribution

It extends wave turbulence analysis to two-field inflation models, examining power spectra, thermalization temperature, and effective equation of state post-backreaction.

Findings

Power spectra resemble single-field models.

Estimated thermalization temperature from energy density spectra.

Determined effective equation of state after backreaction.

Abstract

The present work is the continuation of the investigation of aspects of wave turbulence in preheating we have started in Refs. [1, 2] but considering several classes of inflationary two-fields models. We exhibit the main elements of the wave turbulence phase imprinted in the power spectra of relevant quantities in the time and space domains. As a general feature, the power spectra resemble in their structure to those obtained using the single nonminimally coupled scalar field of the previous work. As a consequence, we obtained an estimate of the temperature corresponding to the thermalized phase from the power spectrum of the total energy density. Another feature allowed by the simulations was the determination of the effective equation of state after taking into account the backreaction of the produced particles.