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Shapiro Delay

  1. Aug 7, 2008 #1
    How is the Shapiro Delay interpreted in GR?
    Is it that the curvature of space is increased around a massive body causing the path length to increase?
    Or is it because time dilates making the speed of light appear to slow?
    Or something else?
  2. jcsd
  3. Aug 7, 2008 #2
    The term delay in "Shapiro delay" is of questionable use. The light travel time simply increases when a massive or energetic source is near the travel path. If you use light travel time as a measure of distance (which I think is a very practical thing to do) you could say that distances increase between two points if a massive or energetic source is in the vicinity of the path between them.
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