Thursday, July 11, 2019

special relativity - What is the Light Cone and we do we need it?



It is defined as $x\cdot x = 0$. 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? I don't see how this concept came about.




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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