Superluminal Propagation on a Moving Braneworld

Abstract

We consider a braneworld scenario in the simplest setting, $M_4\times S^1$, with a 4D Minkowski metric induced on the brane, and establish the possibility of superluminal propagation. If the brane is at rest, the 4D Lorentz symmetry of the brane is exact, but if the brane is in motion, it is broken globally by the compactification. By measuring bulk fields, an observer on the brane sees a slice through a higher-dimensional field profile, which carries an imprint of the extra dimensions even when the brane is at rest. If the brane is in motion we find that bulk fields can propagate outside the brane lightcone by a parametrically large amount set by the brane velocity. We mention observational tests and possible applications to cosmology.

arXiv comment19 pages. v2: references added

References in corpus (11)

• A Large Mass Hierarchy from a Small Extra Dimension
• The Hierarchy Problem and New Dimensions at a Millimeter
• New Dimensions at a Millimeter to a Fermi and Superstrings at a TeV
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang
• Neutrino Masses from Large Extra Dimensions
• Tests of Lorentz invariance: a 2013 update
• Light Neutrinos without Heavy Mass Scales: A Higher-Dimensional Seesaw Mechanism
• Geometrodynamics of Variable-Speed-of-Light Cosmologies
• Probes of Lorentz Violation in Neutrino Propagation
• Brane-World Motion in Compact Dimensions

Cited by in corpus (5)

• Back to the Future: Causality on a Moving Braneworld
• Dark Dimension and the Effective Field Theory limit
• Exploring causality in braneworld/cutoff holography via holographic scattering
• Klein Bottle Cosmology
• Superluminal propagation along the brane in space with extra dimensions