Recent content by Jakz

Thanks Dale, Saw, and Ibix for your clarifying comments. I definitely was being sloppy in letting myself think of "interval" as a distance. But, if I may, two follow-up questions: 1. I've always understood "invariant" to mean something like "that which really exists". That is, invariant...

Thanks everyone for the responses. I feel I'm on the cusp of understanding this, but not quite there. Distance is exactly what I don't get about Minkowski space. What is it, if it collapses to zero for light? And it's not just at the limit that this matters: distance goes towards zero as...

Thanks. It's actually due to that last point that I was wondering about the physical significance of null intervals. Can information be transmitted at the intersection of null cones? I've seen this put forward as a potential explanation for entanglement: the particles are connected along the...

Hi all, I've been trying to wrap my mind around the physical meaning of null spacetime intervals. I understand the metric of Minkowski geometry. And I understand that photons have no proper time and no reference frame: the spacetime interval between the emission and absorption of a photon is...