Lorentz violation and the speed of gravitational waves in brane-worlds

TL;DR

This paper explores how Lorentz violation in brane-world models can cause gravitational waves to travel faster in the bulk than on the brane, providing a potential observable signature of extra-dimensional physics.

Contribution

It establishes a relationship between gravitational wave speeds in the bulk and on the brane under Lorentz violation, independent of extra dimension signature.

Findings

Gravitational waves can travel faster in the bulk than on the brane due to Lorentz violation.

The effect is independent of the signature of the extra dimension.

Lorentz violation could lead to observable differences in gravitational wave propagation.

Abstract

Lorentz violation in a brane-world scenario is presented and used to obtain a relationship between the speed of gravitational waves in the bulk and that on the brane. Lorentz violating effects would manifest themselves in gravitational waves travelling with a greater speed in the bulk than on the brane and this effect is independent of the signature of the extra dimension.