Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vacuum Polarization in QED with World-Line Methods   Motivated by several recent papers on string-inspired calculations in QED, we
here present our own use of world-line techniques in order to calculate the
vacuum polarization and effective action in scalar and spinor QED with external
arbitrary constant electromagnetic field configuration.

21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys