Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bremsstrahlung Radiation as Coherent State in Thermal QED   Based on fully finite temperature field theory we investigate the radiation
probability in the bremsstrahlung process in thermal QED. It turns out that the
infrared divergences resulting from the emission and absorption of the real
photons are canceled by the virtual photon exchange processes at finite
temperature. The full quantum calculation results for soft photons radiation
coincide completely with that obtained in the semi-classical approximation. In
the framework of Thermofield Dynamics it is shown that the bremsstrahlung
radiation in thermal QED is a coherent state, the quasiclassical behavior of
the coherent state leads to above coincidence.

34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn