Is the Shapiro Delay a Result of Space Curvature or Time Dilation?

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SUMMARY

The Shapiro Delay is primarily interpreted as a consequence of the curvature of space around massive bodies, which increases the effective path length of light traveling near these objects. While time dilation is a factor in General Relativity (GR), the discussion emphasizes that the term "delay" may be misleading, as it refers to the increased light travel time due to the presence of mass or energy. This phenomenon illustrates how gravitational fields affect the propagation of light, leading to a practical understanding of distance measurement in the presence of massive sources.

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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?
 
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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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