Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unitarity violation in sequential neutrino mixing in a model of extra
  dimensions   We investigate the possibility of unitarity violation in the sequential
neutrino mixing matrix in a scenario with extra compact spacelike dimensions.
Gauge singlet neutrinos are assumed to propagate in one extra dimension, giving
rise to an infinite tower of states in the effective four-dimensional theory.
It is shown that this leads to small lepton-number violating entries in the
neutrino mass matrix, which can violate unitarity on the order of one per cent.

30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat