Braneworlds in constant and accelerated motion and their causal characteristics

A bstract We generalize previous work on the signatures of bulk signals detected by brane-based observers in a spacetime with a compactified dimension. When such braneworlds move with constant velocities or constant proper accelerations in the extra dimension, the observers may witness apparent superluminal signaling. Our analysis includes tilted branes that are partially wrapped along the compact dimension. We identify parameters that help characterize various scenarios, and verify that anisotropies arising in the propagation of signals through the bulk ensure that causality is not violated, despite the apparent superluminal signaling effects. Some of the effects studied here could be the basis for alternative cosmological models, as well as observable signatures of braneworld scenarios.