Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermionic and bosonic pair creation in an external electric field at
  finite temperature using the functional Schr\"odinger representation   We solve the time evolution of the density matrix both for fermions and
bosons in the presence of a homogeneous but time dependent external electric
field. The number of particles produced by the external field, as well as their
distribution in momentum space is found for finite times. Furthermore, we
calculate the probability of finding a given number of particles in the
ensemble. In all cases, there is a nonvanishing thermal contribution. The
bosonic and the fermionic density matrices are expressed in a "functional field
basis". This constitutes an extension of the "field basis" concept to fermions.

23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
9
The categories of this paper are: nlin