Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized Pions in Dense QCD   QCD superconductors in the color-flavor-locked (CFL) phase sustain light
Goldstone modes (that will be referred to as generalized pions) that can be
described as pairs of particle and/or hole excitations around a gapped Fermi
surface. In weak coupling and to leading logarithm accuracy, their form factor,
mass and decay constant can be evaluated exactly. These modes are found to
satisfy an axial-Ward-identity, constraining the mass of the Goldstone modes in
the CFL phase.

34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph