Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino Superfluidity   It is shown that Dirac-type neutrinos display BCS superfluidity for any
nonzero mass. The Cooper pairs are formed by attractive scalar Higgs boson
exchange between left- and right-handed neutrinos; in the standard SU(2)xU(1)
theory, right-handed neutrinos do not couple to any other boson. The value of
the gap, the critical temperature, and the Pippard coherence length are
calculated for arbitrary values of the neutrino mass and chemical potential.
Although such a superfluid could conceivably exist, detecting it would be a
major challenge.

29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin