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We present a fully nonlinear study of the development of equilibrium afterpreheating. Preheating is the exponentially rapid transfer of energy from thenearly homogeneous inflaton field to fluctuations of other fields and/or theinflaton itself. This rapid transfer leaves these fields in a highly nonthermalstate with energy concentrated in infrared modes. We have performed latticesimulations of the evolution of interacting scalar fields during and afterpreheating for a variety of inflationary models. We have formulated a set ofgeneric rules that govern the thermalization process in all of these models.Notably, we see that once one of the fields is amplified through parametricresonance or other mechanisms it rapidly excites other coupled fields toexponentially large occupation numbers. These fields quickly acquire nearlythermal spectra in the infrared, which gradually propagates into highermomenta. Prior to the formation of total equilibrium, the excited fields groupinto subsets with almost identical characteristics (e.g. group effectivetemperature). The way fields form into these groups and the properties of thegroups depend on the couplings between them. We also studied the onset of chaosafter preheating by calculating the Lyapunov exponent of the scalar fields.Comment: 15 pages, 23 figure

Development of equilibrium after preheating