Figure 3. Schematic presentation of the behavior of the relativistic distance difference ∆r as function of the speed v. It shows the speed-gap (dashed lines) between sub- and superluminal states and the change in sign of ∆r under light-barrier traversal

From

Superluminality and Finite Potential Light-Barrier Crossing

T. G.M. Gerlitz

International Journal of Physics. 2021, 9(5), 234-239 doi:10.12691/ijp-9-5-2