Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonequilibrium quantum fields with large fluctuations   We consider the nonequilibrium evolution of an O(N)-symmetric scalar quantum
field theory using a systematic two-particle irreducible 1/N-expansion to
next-to-leading order, which includes scattering and memory effects. The
corresponding ``full Kadanoff-Baym equations'' are solved numerically without
further approximations. This allows one to obtain a controlled nonperturbative
description of far-from-equilibrium dynamics and the late-time approach to
quantum thermal equilibrium. Employing in addition a first-order gradient
expansion for the Wigner transformed correlators we derive kinetic equations.
In contrast to standard descriptions based on loop expansions, our equations
remain valid for nonperturbatively large fluctuations. As an application, we
discuss the fluctuation dominated regime following parametric resonance in
quantum field theory.

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The categories of this paper are: cs
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
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The categories of this paper are: stat
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int