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Gravity and time

  1. Dec 18, 2008 #1
    If gravity slows time, how and are they linked?
     
  2. jcsd
  3. Dec 18, 2008 #2

    mgb_phys

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    How :
    t = t_f sqrt(1 - 2GM/rc^2) M is the mass, r is the distance from centre of mass

    Why :
    simple answer - because that's what general relativity says.
    complex answer - because thats the way the universe works.
     
  4. Dec 18, 2008 #3
    Yep that clears it aaaaall up.

    Lol
    Chris
     
  5. Dec 18, 2008 #4

    mgb_phys

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    If you want to work out how much to adjust your GPS satelite clock, or how much longer you will live on the top floor of the apartment - then the equation tells you.
    As to why, there are answers involving space time tensors, kerr metrics, relativistic frame dragging etc - but they pretty much come down "because it does" but with more maths.
     
  6. Dec 18, 2008 #5
    Ok it's complicated.
    Thanks
    Chris
     
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