Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Functional Integral Approach to the N-Flavor Schwinger Model   We study massless QED_2 with N flavors using path integrals. We identify the
sector that is generated by the N^2 classically conserved vector currents. One
of them (the U(1) current) creates a massive particle, while the others create
massless ones. We show that the mass spectrum obeys a Witten-Veneziano type
formula. Two theorems on n-point functions clarify the structure of the Hilbert
space. Evaluation of the Fredenhagen-Marcu order parameter indicates that a
confining force exists only between charges that are integer multiples of +/-
Ne, whereas charges that are nonzero mod(N) screen their confining forces and
lead to non-vacuum sectors. Finally we identify operators that violate
clustering, and decompose the theory into clustering theta vacua.

23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
16
The categories of this paper are: stat
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph