Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Conformal Algebras and Closed Conformal Field Theory   We investigate the quantum conformal algebras of N=2 and N=1 supersymmetric
gauge theories. Phenomena occurring at strong coupling are analysed using the
Nachtmann theorem and very general, model-independent, arguments. The results
lead us to introduce a novel class of conformal field theories, identified by a
closed quantum conformal algebra. We conjecture that they are the exact
solution to the strongly coupled large-N_c limit of the open conformal field
theories. We study the basic properties of closed conformal field theory and
work out the operator product expansion of the conserved current multiplet T.
The OPE structure is uniquely determined by two central charges, c and a. The
multiplet T does not contain just the stress-tensor, but also R-currents and
finite mass operators. For this reason, the ratio c/a is different from 1. On
the other hand, an open algebra contains an infinite tower of non-conserved
currents, organized in pairs and singlets with respect to renormalization
mixing. T mixes with a second multiplet T* and the main consequence is that c
and a have different subleading corrections. The closed algebra simplifies
considerably at c=a, where it coincides with the N=4 one.

30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
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
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess