Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiation of the blackbody in the external field   The blackbody is considered in the external general field. The additional
coefficients of stimulated emission and absorption are introduced into the
Einstein mechanism. Then, the generalized Planck formula is derived. The
Einstein and Debye formula for the specific heat is possible to generalize. The
application of the theory to the sonoluminescence, the relic radiation and
solar spectrum is discussed.

29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex