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Negative Metric Signature

  1. Jul 18, 2011 #1

    Is a metric signature of [itex](-,-,-,-)[/itex] unphysical?

  2. jcsd
  3. Jul 18, 2011 #2


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    You can flip all four signs in the signature, and it doesn't mean anything in terms of connection with observation. For example, my favorite signature is +---, but much of the literature uses -+++. They don't mean anything physically different.

    So ---- would be physically identical to ++++, describing Euclidean four-space. Such a space has no time dimension, just space.
  4. Jul 18, 2011 #3
    Thank you very much.
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