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

Abstract

This work is the continuation of the investigation of aspects of wave turbulence in preheating we started in [J. A. Crespo and H. P. de Oliveira, J. Cosmol. Astropart. Phys. 12 (2019) 045; (2014) 006] but considering several classes of inflationary two-field 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.