Superluminal neutrinos and extra dimensions: constraints from the null energy condition

TL;DR

This paper reviews a simple extra-dimensional approach to explain superluminal neutrinos as suggested by OPERA results, highlighting the difficulty of avoiding null energy condition violations in such models.

Contribution

It analyzes the challenges of modeling superluminal neutrinos within extra-dimensional frameworks while respecting fundamental energy conditions.

Findings

Superluminal neutrinos can be modeled with extra dimensions.

Avoiding null energy condition violations is difficult in these models.

The strategy faces fundamental theoretical constraints.

Abstract

In light of the recent results from the OPERA collaboration, indicating that neutrinos can travel superluminally, I review a simple extra-dimensional strategy for accommodating such behavior; and I also explain why it is hard in this strategy to avoid violating the null energy condition somewhere in the extra dimensions.