Neutrino Physics in TeV Scale Gravity Theories

TL;DR

This paper explores how TeV scale quantum gravity theories like ADD and Many Species Theory can naturally generate small neutrino masses, affect neutrino oscillations, and have testable phenomenological implications.

Contribution

It generalizes the neutrino mass generation mechanism to a realistic three-flavour case and provides a method to diagonalize the resulting mass matrix within these theories.

Findings

Neutrino masses can be generated naturally in TeV scale gravity models.

The approach allows analysis of effects on neutrino oscillations and unitarity.

Potential phenomenological signatures could be tested in current neutrino experiments.

Abstract

In this paper, the general features of the neutrino sector in TeV scale quantum gravity theories, such as ADD and Many Species Theory, is investigated. This class of theories has an inherent way to generate small neutrino masses. After reviewing this mechanism it is generalized to a realistic three-flavour case. Furthermore, a procedure is presented how to diagonalize a mass matrix which is generated by this class of theories and how one can find the Standard Model flavour eigenstates. The developed general approach is applied to two specific scenarios within ADD and Many Species Theory and possible effects on neutrino oscillations and on unitarity of the lepton mixing matrix are calculated. Finally, a short overview of phenomenology which can be potentially testable by the nowadays neutrino experiments is presented.