Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black-body photon clustering by semi-classical means   If stimulated emission could be turned off then only uncorrelated photons
would be emitted from black bodies and the photon counting statistics would be
Poissonian. Through the process of stimulated emission, some fraction of the
photons emitted from a black body are correlated and thus emitted in clusters.
This photon clustering can be calculated by semi-classical means. The
corresponding results are in agreement with quantum theory.

36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int