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I Time reveral operator

  1. May 7, 2017 #1
    Hello! I am a bit confused about the physical meaning of time reversal operator (both in classical and quantum/QFT physics). Classically if we drop a ball, I can easily see why this is invariant under the translation operator, but I am not sure I understand how does it work with the time reversal. We would see a ball increasing its velocity upwards, despite having a force acting on it downwards? How does this work?
  2. jcsd
  3. May 7, 2017 #2


    Staff: Mentor

    No, we would not see that. The path of a ball is given by ##y(t)=-\frac{g}{2}t^2+v_0 t +y_0##

    What do you get if you map ##t \to -T##
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