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Vaidya metric and Wiki article

  1. Nov 4, 2012 #1

    Mentz114

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    In the Wiki article http://en.wikipedia.org/wiki/Vaidya_metric it states that

    but it looks to me as if the 'particles' are travelling at the speed of light ( null propagation vector field ) and so must have zero rest mass. Is this a typo or have I misunderstood something ?
     
  2. jcsd
  3. Nov 4, 2012 #2

    Bill_K

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    Sure enough, it's a mistake. The matter in the Vaidya metric is what is known as "null dust". Zero mass but incoherent, it can be thought of as the high-frequency limit of electromagnetic radiation.
     
  4. Nov 4, 2012 #3

    Mentz114

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    Thanks, Bill_K. I've edited the page. Now says 'zero rest mass'.
     
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