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  • Users: pmr
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  1. P

    Train thought experiment confusion

    I think we need to put mathematical labels on things in order to make sense of this. I'm going to propose the following scenario: Jack on the platform thinks that he is globally at rest. We will call his frame ##Q##. Ashley is on the train, and she doesn't care to look outside of it. From...
  2. P

    4-Velocity and World Line Parameterization

    I would like to think that I understand how 4-velocity is defined in special relativity. It makes sense to me that one takes a differential segment of the world line ##(dt, d\vec x)## and translates it into a frame in which its spatial component disappears, leaving only ##(d\tau, 0) =...