Year: 2022
Type: article
Abstract: We consider a braneworld scenario in the simplest setting, ${M}_{4}\ifmmode\times\else\texttimes\fi{}{S}^{1}$, with a four-dimensional (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 light cone by a parametrically large amount set by the brane velocity. We mention observational tests and possible applications to cosmology.
Authors: Brian Greene, Daniel Kabat, Janna Levin, Arjun S. Menon
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4304086168