Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particle production in field theories coupled to strong external
  sources. II: Generating functions   We discuss a method for computing the generating function for the
multiplicity distribution in field theories with strong time dependent external
sources. At leading order, the computation of the generating function reduces
to finding a pair of solutions of the classical equations of motion, with
non-standard temporal boundary conditions.

34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio