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Tachyonic Energies in a Minkowski Metric

  1. Jan 31, 2012 #1
    So I'm working on a problem (Hartle problem 6, chapter 6) dealing with tachyons. So far, I have determined the four-velocity and the four-momentum (up to a sign) of a tachyon. I have, with the four-velocity being a unit spacelike four-vector,
    [itex]u^{\alpha}=\frac{\pm 1}{\sqrt{\vec{V}^2-1}}(1,\vec{V})

    (Sorry about the bad formatting...).

    I don't want to just assume the positive values of [itex]u^{\alpha}[/itex].

    I need help figuring out how to find the energy E given that p=mu.

    I realize I may have not phrased my dilemma well, so please ask for clarification.
  2. jcsd
  3. Jan 31, 2012 #2
    I couldn't find this problem in Hartle. Problem 6 in chapter 6 is about transforming into the coordinates of an accelerated frame. I'm also not really sure what your question is.
  4. Jan 31, 2012 #3


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    Don't really have time to comment on the OP's dilemma, but I believe it's ch.5 problem 23.
  5. Feb 1, 2012 #4
    Yes, you're right. I was about to change it. Thanks for noting.
  6. Feb 1, 2012 #5
    I figured it out. I found my energy-momentum for tachyons to be given by

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