Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Loop representation for 2-D Wilson lattice fermions in a scalar
  background field   We show that the fermion determinant for 2-D Wilson lattice fermions coupled
to an external scalar field is equivalent to self avoiding loops interacting
with the external field. In an application of the resulting formula we
integrate the scalar field with a Gaussian action to generate the N-component
Gross-Neveu model. The loop representation for this model is discussed.

36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph