Gravitational Lorentz Violations from M-Theory

TL;DR

This paper explores gravitational Lorentz violations in braneworld models derived from M-theory, showing how different p-brane configurations can lead to localized or massive gravitons and apparent superluminal effects.

Contribution

It introduces new braneworld scenarios from p-brane systems in M-theory that exhibit Lorentz violations while maintaining local invariance.

Findings

Massless graviton can be quasi-localized in certain p-brane intersections.

Perturbed p-branes can produce massive quasi-localized gravitons.

Gravitons in global AdS_5 can travel faster in the bulk, suggesting superluminal effects.

Abstract

In an attempt to bridge the gap between M-theory and braneworld phenomenology, we present various gravitational Lorentz-violating braneworlds which arise from p-brane systems. Lorentz invariance is still preserved locally on the braneworld. For certain p-brane intersections, the massless graviton is quasi-localized. This also results from an M5-brane in a C-field. In the case of a p-brane perturbed from extremality, the quasi-localized graviton is massive. For a braneworld arising from global AdS_5, gravitons travel faster when further in the bulk, thereby apparently traversing distances faster than light.