CERN Accelerating science

Article
Report number	hep-ph/0403101
Title	Turbulent Thermalization
Author(s)	Micha, Raphael (ETH Zürich) ; Tkachev, Igor I (CERN ; Inst. Nucl. Res. of the Russian Academy of Sciences, Moscow, Russia)
Publication	2004
In:	Phys. Rev. D 70 (2004) 043538
DOI	10.1103/PhysRevD.70.043538
Subject category	Particle Physics - Phenomenology
Abstract	We study, analytically and with lattice simulations, the decay of coherent field oscillations and the subsequent thermalization of the resulting stochastic classical wave-field. The problem of reheating of the Universe after inflation constitutes our prime motivation and application of the results. We identify three different stages of these processes. During the initial stage of ``parametric resonance'', only a small fraction of the initial inflaton energy is transferred to fluctuations in the physically relevant case of sufficiently large couplings. A major fraction is transfered in the prompt regime of driven turbulence. The subsequent long stage of thermalization classifies as free turbulence. During the turbulent stages, the evolution of particle distribution functions is self-similar. We show that wave kinetic theory successfully describes the late stages of our lattice calculation. Our analytical results are general and give estimates of reheating time and temperature in terms of coupling constants and initial inflaton amplitude.

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