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I Dirac's Rest Mass in Minowski Spacetime

  1. Nov 29, 2017 #1
    Dirac's rest mass seems to be expressed as a fourth dimension. If we were to try to include this rest-mass dimension into Minowski space time, could it be expressed as a distance in space? S^2=x^2+y^2+z^2+(rest-mass dimension)^2-(ct)^2?
     
  2. jcsd
  3. Nov 29, 2017 #2

    vanhees71

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    Think about the dimensions in your expression! You'll see that it doesn't make any sense, and I'm pretty sure Dirac has never written such a nonsensical formula ;-).
     
  4. Nov 30, 2017 #3
    Thank you again for the reply. Was I mistaken then in thinking of rest mass as a fourth dimension?
     
  5. Nov 30, 2017 #4

    vanhees71

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    Of course, how can a mass (dimension kg in the SI) be a fourth dimension of space (dimension metre in the SI)? It's simply not making the slightest sense! Where have you gotten this idea from?
     
  6. Nov 30, 2017 #5

    PeterDonis

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    Where are you getting that from?
     
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