Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Condensed Matter Limit of Relativistic QFT   I study how to apply relativistic quantum field theory to condensed matter
systems. The motivation for this is examined and then two separate elements are
considered. First we identify the precise relationship between relativistic and
non-relativistic fields. Second we consider the need for a chemical potential
and how one includes this in static and dynamical calculations.

1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin