Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conformal blocks attached to twisted groups   The aim of this paper is to generalize the notion of conformal blocks to the
situation in which the Lie algebra they are attached to is not defined over a
field, but depends on covering data of curves. The result will be a sheaf of
conformal blocks on the Hurwitz stack parametrizing Galois coverings of curves.
Many features of the classical sheaves of conformal blocks are proved to hold
in this more general setting, in particular the fusion rules, the propagation
of vacua and the WZW connection.

27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn