Sep 19, 2021 · Light Cone in spacetime The light cone of event O is the set of events reached by lightlike geodesics from O into the past and into the future, which describes the spacetime evolution of a flash of light.

Mar 26, 2025 · Correction though: events in my past lightcone mean events that are by the laws of physics eligible for me to be able to observe, where what ( i actually can observe is limited by other restrictions of course such as brightness or frequency ot …

Sep 2, 2021 · I have a very basic question about light-cone coordinates. Any four-vector in space time can be rewritten from the usual way (one time, three-spatial) to light-cone coordinates $$ (x^0, x^1, x^2, x...

Apr 30, 2020 · 1) All vectors on the light-cone are light-like, all vectors in the interior of the light-cone are time-like and all vectors in the exterior of the light-cone are space-like. 2) All space-like vectors lie in the exterior of the light-cone, all time-like vectors lie in the interior of light-cone, and all light-like vectors lie on the light-cone.

Sep 30, 2018 · A light cone is the path that light travels in a spacetime diagram. Since we cannot travel faster than light (I cannot explain this, Einstein postulated this) we cannot get outside of the light cone.

the transformation to light cone co-ordinates is a rotation (through 45 degrees) involving time, which thus leaves the form (x0)2 + (x3)2 (x 0) 2 + (x 3) 2 invariant, not (x0)2 − (x3)2 (x 0) 2 − (x 3) 2 so by definition the transformation cannot belong to the Lorentz group (spatial co-ordinate rotations of course do belong).

Dec 12, 2016 · How is this justified? Also, why does the backward light cone need to exist? It is said that light emitted in a backward cone would pass through the origin. But why? Wouldn't it just create another forward cone with a different origin? And the most important thing is: what is this Light Cone concept actually about?

Aug 13, 2021 · The past light cone is a concept in the theory of special relativity that represents the set of all events that could have caused an event in the present. It is a 4-dimensional structure, with three spatial dimensions and one time dimension, and it has a finite extension in 3D space. The past light cone is determined by the speed of light, which is the maximum …

Nov 12, 2009 · Hi there, How is the light-cone gauge useful for a quantum relativistic particle and for a quantum relativistic string? Why is it important that the light-cone gauge is used? Does it actually simplify the mathematics a lot? Thanks

Nov 3, 2009 · Even in relativistic quantum theory it's possible to prove that quantum effects like entanglement and tunneling cannot be used to transmit information faster than light. So, the future light cone of an event E still represents all the points in spacetime that could possibly have access to information regarding E.