Asymmetrically Warped Brane Models, Bulk Photons and Lorentz Invariance

TL;DR

This paper reviews asymmetrically warped brane models with different time and space warp factors, showing that bulk photons exhibit energy-dependent speeds due to Lorentz invariance violations, constrained by astrophysical data.

Contribution

It introduces and analyzes the effects of asymmetric warping on bulk photon dispersion relations, highlighting potential Lorentz invariance violations and observational constraints.

Findings

Bulk photons have nonlinear dispersion relations.

Energy-dependent speed of light is predicted.

Constraints from gamma-ray observations limit model parameters.

Abstract

We present a brief review of our recent work [1] on asymmetrically warped brane models, where the background metric is characterized by different time and space warp factors. In particular we examine the case of bulk photons and we show that the standard Lorentz invariant dispersion relation is corrected by nonlinear terms which lead to an Energy-dependent speed of light. Stringent constraints on the parameters of our models can be set by comparing the results with recent data from high-energy Gamma-Ray Astrophysics, for instance the MAGIC Telescope.