Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Models of Neutrino Mass with a Low Cutoff Scale   In theories with a low quantum gravity scale, global symmetries are expected
to be violated, inducing excessive proton decay or large Majorana neutrino
masses. The simplest cure is to impose discrete gauge symmetries, which in turn
make neutrinos massless. We construct models that employ these gauge symmetries
while naturally generating small neutrino masses. Majorana (Dirac) neutrino
masses are generated through the breaking of a discrete (continuous) gauge
symmetry at low energies, e.g., 2 keV to 1 GeV. The Majorana case predicts
\Delta N_\nu \simeq 1 at BBN, neutrinoless double beta decay with scalar
emission, and modifications to the CMB anisotropies from domain walls in the
universe as well as providing a possible Dark Energy candidate. For the Dirac
case, despite the presence of a new light gauge boson, all laboratory,
astrophysical, and cosmological constraints can be avoided.

37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs