Probing Large Extra Dimensions With IceCube

TL;DR

This paper investigates how large extra dimensions affect high-energy atmospheric neutrinos and uses IceCube data to set bounds on the size of these extra dimensions, linking theoretical models with experimental observations.

Contribution

It establishes a detailed equivalence between large extra dimension models and a (3 + n) sterile neutrino framework, and applies IceCube data to constrain the size of extra dimensions.

Findings

Bounds on the radius of extra dimensions derived from IceCube data

Equivalence between large extra dimensions and sterile neutrino models clarified

Implications for neutrino mass generation mechanisms

Abstract

In models with Large Extra Dimensions the smallness of neutrino masses can be naturally explained by introducing gauge singlet fermions which propagate in the bulk. The Kaluza-Klein modes of these fermions appear as towers of sterile neutrino states on the brane. We study the phenomenological consequences of this picture for the high energy atmospheric neutrinos. For this purpose we construct a detailed equivalence between a model with large extra dimensions and a (3 + n) scenario consisting of three active and n extra sterile neutrino states, which provides a clear intuitive understanding of Kaluza-Klein modes. Finally, we analyze the collected data of high energy atmospheric neutrinos by IceCube experiment and obtain bounds on the radius of extra dimensions.