Communication through an extra dimension

TL;DR

This paper proposes a model where our universe is a shell in a five-dimensional space, allowing superluminal signals through the extra dimension that maintain causality with variable velocities.

Contribution

It introduces a novel five-dimensional framework where signals can travel faster than light without violating causality in our universe.

Findings

Signals can propagate superluminally through the fifth dimension.

Causality is preserved despite superluminal signal speeds.

Propagation velocities depend on the fifth coordinate.

Abstract

If our visible universe is considered a trapped shell in a five-dimensional hyper-universe, all matter in it may be connected by superluminal signals traveling through the fifth dimension. Events in the shell are still causal, however, the propagation of signals proceeds at different velocities depending on the fifth coordinate.