Can Light Experience Doppler-Equivalent Slingshotting Near Massive Bodies?

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Discussion Overview

The discussion revolves around whether light passing close to a massive body experiences a Doppler-equivalent effect, akin to slingshotting, resulting in blue-shifting or red-shifting based on its trajectory. The scope includes theoretical considerations and conceptual implications of light's interaction with massive objects.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants propose that light could experience a Doppler effect similar to slingshotting, suggesting it may be blue-shifted or red-shifted depending on its path relative to a massive body.
  • One participant argues that slingshotting is an elastic collision, implying that the interaction between light and the massive body must also be elastic.
  • Another participant clarifies that light passing through the trailing path of a moving object, like Jupiter or a galaxy, would appear blue-shifted compared to light passing at a distance from the mass.
  • There is a suggestion that light could "steal" momentum from the massive body, resulting in a slowing effect on the body while simultaneously causing the light to be up-shifted.

Areas of Agreement / Disagreement

Participants express varying degrees of agreement on the concept of light experiencing a Doppler effect near massive bodies, but the discussion remains unresolved regarding the specifics of the interaction and its implications.

Contextual Notes

The discussion does not clarify the assumptions underlying the proposed elastic nature of the interaction or the definitions of slingshotting in this context. There are also unresolved questions regarding the mechanics of momentum transfer between light and massive bodies.

DaveC426913
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Someone asked an intriguing question:
Does light passing close to a massive body experience the Doppler-equivalent of slingshotting?
i.e. blue-shifted or red-shifted, depending on its path?
(I guess the light would be acting as the third body in a three-body system?)
 
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DaveC426913 said:
Someone asked an intriguing question:
A friend of a friend, I suppose...? :wink:
 
DaveC426913 said:
Does light passing close to a massive body experience the Doppler-equivalent of slingshotting?
It must since the slingshotting is just an elastic collision and the interaction would have to be elastic wouldn’t it?
 
berkeman said:
A friend of a friend, I suppose...? :wink:
Somebody on another forum. I didn't have a good answer for him, so I came to the 'sperts.
 
Dale said:
It must since the slingshotting is just an elastic collision and the interaction would have to be elastic wouldn’t it?
So, to be clear, what we're giving a thumbs-up to here is that light passing through the trailing path of a moving object, such as Jupiter or a galaxy, would appear slightly blue-shifted compared to light passing at a distance from the mass.

The light would steal a bit of momentum from the mass, slowing it down, while the light, in-turn, up-shifted.
 

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