Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Statistical physics of the inflaton decaying in an inhomogeneous random
  environment   We derive a stochastic wave equation for an inflaton in an environment of an
infinite number of fields. We study solutions of the linearized stochastic
evolution equation in an expanding universe. The Fokker-Planck equation for the
inflaton probability distribution is derived. The relative entropy (free
energy) of the stochastic wave is defined. The second law of thermodynamics for
the diffusive system is obtained. Gaussian probability distributions are
studied in detail.

37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph