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Physical Review D

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Models of neutrino mass with a low cutoff scale

Hooman Davoudiasl^1,2, Ryuichiro Kitano², Graham D. Kribs^2,3, and Hitoshi Murayama^4,5,2

¹Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
²School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540, USA
³Department of Physics, University of Oregon, Eugene, Oregon 97403, USA*
⁴Department of Physics, University of California, Berkeley, California 94720, USA
⁵Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

^*On leave of absence.

Phys. Rev. D 71, 113004 – Published 7 June, 2005

DOI: https://doi.org/10.1103/PhysRevD.71.113004

Abstract

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., $2 keV - 1 GeV$ . The Majorana case predicts $Δ N_{ν} ≃ 1$ 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.

Article Text

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