|Apr11-12, 01:06 PM||#35|
Gravitionel redshift – How is it working?
|Apr11-12, 01:55 PM||#36|
|Apr11-12, 02:21 PM||#37|
|Apr24-12, 08:00 PM||#38|
I wish to respond to your post in which you said:
"Do you have either a) a reference or b) a thought experiment which illustrates "spatial compression" due to gravity?"
The use of the words "spatial compression" was indeed in error and rather Newtonian. In General Relativity the words "spacial distortion in four dimensional space-time" would be more accurate. And my reference was a thought experiment in which I was trying to visualize the gravitational redshift problem, just made an error in wording.
"It mostly seems to come up from laypeople who think it should be obvious, but it always seems like the references or details are lacking"
I'm not a layperson, although I have not been able to have access to the sciences, scientists, references, etc, like when I was still in college.
"I should add that there is a reasonable amount written about "expanding space" in the context of cosmology, but the spatial expansion there isn't caused by gravity. In the end, in cosmology "expanding space" boils down to a coordinate choice."
Being that black-holes were mentioned I was also considering the effects of expanding space as it is suggested by theory considering dark-energy, and the in-falling spacial distortion when one crosses the Schwarzschild radius where 4d space-time falls in faster than light-speed. I am afraid that my math is not good enough to explain this. It would require a good working knowledge of Quantum-Gravity.
As to the original problem:
I believe that the most important observer in this case would be the observer at the target. I do not know what the blue-shift effects observed at the target would be. Blue-shifted photons would imply higher energy but I can not at this time think of where the extra energy could be coming from. The photons ordinal energy state would not have been changed. I could only guess that it could be a gravitational effect yet unknown, or possibly known but hasn't been applied to this problem, it could be due to some kind of Higg's-Field interaction.
The solution to this thought experiment might lead to a better understanding of gravitational effects.
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