Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino flavor oscillations in a curved space-time   Using a WKB approximation of the Dirac equation in a curved spacetime, we
obtain the expression for the phase shift between two neutrino mass eigenstates
in a generic gravitational field. We apply this expression to two specific
space-time geometries, namely the Kerr-Newman metric describing a rotating and
charged black hole, and the Friedmann-Robertson-Walker metric.

9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs