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Cosmological redshift as a Doppler effect or metric evolution?

  1. May 6, 2010 #1


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    In several threads where I've seen the redshift issue discussed there's been some confusion about this point, Must we treat cosmological redshift as a purely kinematic (relativistic)doppler effect or as the time dymamics of the metric space? Or both views can be made to converge?
  2. jcsd
  3. May 7, 2010 #2


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    There's no question that for distant objects, one has to take into account the curvature of space-time to get the right answer for the redshift. For nearer objects, this just reduces to a relativistic doppler effect. When you start getting out to around a Hubble radius, however, this starts to become rather wrong and you have to take into account the space-time curvature.
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