Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stochastic wave equation with thermal noise in an expanding universe   We discuss Einstein-Klein-Gordon system in an environment of an infinite
number of scalar fields leading to an external thermal noise. In the lowest
order of metric and field perturbations the quadratic fluctuations consist of a
sum of quantum and thermal fluctuations. We show that these fluctuations depend
on the form of the interaction of the inflaton with the environment.

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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th