Ultrahigh-energy neutrino flux as a probe of large extra-dimensions

TL;DR

The paper explores how large extra dimensions could suppress ultrahigh-energy neutrino fluxes, affecting their detectability and providing a way to probe extra-dimensional theories through neutrino observations.

Contribution

It demonstrates that extra-dimensional models predict a suppression of UHE neutrinos, offering a novel method to test such theories with neutrino telescopes.

Findings

Suppression of UHE neutrino flux in extra-dimensional scenarios.

Absence of UHE neutrinos in current and future detectors.

Implication that neutrinos cannot explain the highest energy cosmic rays in these models.

Abstract

A suppression in the spectrum of ultrahigh-energy (UHE, >= 10^{18} eV) neutrinos will be present in extra-dimensional scenarios, due to enhanced neutrino-antineutrino annihilation processes with the supernova relic neutrinos. In the n>4 scenario, being n the number of extra dimensions, neutrinos can not be responsible for the highest energy events observed in the UHE cosmic ray spectrum. A direct implication of these extra-dimensional interactions would be the absence of UHE neutrinos in ongoing and future neutrino telescopes.