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E² = p²c² + (mc²)²

  1. Feb 19, 2005 #1

    quasar987

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    .....................................
     
    Last edited: Feb 19, 2005
  2. jcsd
  3. Feb 19, 2005 #2

    dextercioby

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    Who's ita_{0,x,y,z) ??

    Daniel.
     
  4. Feb 19, 2005 #3

    quasar987

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    As it often happens I found the answer to my question while typing it :tongue2:

    [itex]\eta[/itex] was for the proper speed... i.e. [itex]\eta_{0,x,y,z}[/itex] are the components of the four-velocity. What symbol do you use?
     
  5. Feb 19, 2005 #4

    dextercioby

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    Ita is for the metric...[itex] u_{\mu} [/itex] is the four-velocity...

    Daniel.
     
  6. Feb 19, 2005 #5

    quasar987

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    What's a 'metric' ?
     
  7. Feb 19, 2005 #6

    dextercioby

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    A distance,in mathematics (a metric space is a topological space with a metric)...Here,in physics jargon,it stands for the metric tensor [itex] g_{\mu\nu} [/itex] for spacetime and for the flat Minkowski spactime [itex] \eta_{\mu\nu} [/itex]

    Daniel.
     
  8. Feb 21, 2005 #7

    krab

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    quasar: [itex]\eta[/itex] is pronounced like something between etta and ayta; not eeta.
     
  9. Feb 21, 2005 #8

    dextercioby

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    In Neogreek it is pronounced ITA (eeta,if u want to).True,in Anciant Greek it's ETA...

    Daniel.
     
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