Supersonic and Superluminal Energy and Speed of Information via Temporal Interference in a Dispersionless Environment

arXiv:2510.20060v1 Announce Type: new
Abstract: Numerical implementation of a theory yields acoustic wave packets whose peak-to-peak speeds, $c_{3d}$, are supersonic in a dispersionless medium due to temporal interference between direct and boundary-reflected paths. The effect occurs when the source and receiver are near each other and at least one is within $ctilde{delta t}/2$ of the boundary, where $c$ is the phase speed of propagation in the medium, and $tilde{delta t}$ is the smallest temporal separation between the paths at which interference first occurs. This direct+reflected path effect is distinct from previously-observed superluminal occurrence of group speeds due to anomalous dispersion, quantum tunneling, and cavity vacuum fluctuations. For temporally interfering direct+reflected paths, simulations yield a speed of information less than $c$, though no proof exists $c$ cannot be exceeded. The speed of information from the interfering paths can exceed the speed derived from propagation only along the direct path. We conjecture these results will also hold for electromagnetic (EM) wave propagation, and so the effect may not violate special relativity. These theoretical and simulation results, as well as their conjectured EM extension, should be readily accessible to experimental verification.