Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Notes on gauging noneffective group actions   In this paper we study sigma models in which a noneffective group action has
been gauged. Such gauged sigma models turn out to be different from gauged
sigma models in which an effectively-acting group is gauged, because of
nonperturbative effects on the worldsheet. We concentrate on finite
noneffectively-acting groups, though we also outline how analogous phenomena
also happen in nonfinite noneffectively-acting groups. We find that
understanding deformations along twisted sector moduli in these theories leads
one to new presentations of CFT's, defined by fields valued in roots of unity.

18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin