Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Ward Identities at Finite Temperature   We show both in 1+1 and 3+1 dimensions that, contrary to the recent
suggestions, the contribution of the fermion loop to the polarization tensor is
manifestly transverse at finite temperature. Some subtleties associated with
the Ward identities at finite temperature are also pointed out.

9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs