Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Boundary Conformal Field Theory   Boundary conformal field theory (BCFT) is simply the study of conformal field
theory (CFT) in domains with a boundary. It gains its significance because, in
some ways, it is mathematically simpler: the algebraic and geometric structures
of CFT appear in a more straightforward manner; and because it has important
applications: in string theory in the physics of open strings and D-branes, and
in condensed matter physics in boundary critical behavior and quantum impurity
models. In this article, however, I describe the basic ideas from the point of
view of quantum field theory, without regard to particular applications nor to
any deeper mathematical formulations.

14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc