Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pseudogap and time reversal breaking in a holographic superconductor   Classical SU(2) Yang-Mills theory in 3+1 dimensional anti-de Sitter space is
known to provide a holographic dual to a 2+1 system that undergoes a
superconducting phase transition. We study the electrical conductivity and
spectral density of an isotropic superconducting phase. We show that the theory
exhibits a pseudogap at low temperatures and a nonzero Hall conductivity. The
Hall conductivity is possible because of spontaneous breaking of time reversal
symmetry.

14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin