Does gravity vary with velocity?

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Discussion Overview

The discussion centers on the relationship between gravity and velocity, particularly in the context of Einstein's theory of general relativity compared to Newtonian gravity. Participants explore whether a projectile moving at relativistic speeds near a massive body, such as the sun, would experience different gravitational effects compared to slower-moving bodies.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant suggests that the bending of light around a massive body is velocity dependent, implying that a projectile moving close to the speed of light would experience greater gravitational acceleration than predicted by Newtonian physics.
  • Another participant provides a link to a paper that may address the initial question regarding the relationship between velocity and gravitational effects.
  • A later reply expresses appreciation for the linked paper, indicating that its abstract answered the initial query, while also noting interest in the full paper.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether gravity varies with velocity, as the discussion primarily revolves around the implications of existing theories and the referenced paper without definitive conclusions.

Contextual Notes

The discussion includes references to specific theoretical frameworks (Newtonian gravity vs. Einstein's general relativity) and relies on interpretations of scientific literature, which may have limitations based on the assumptions made in those frameworks.

Zman
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Einstein calculated that the bending of light around a body is twice the value that Newton calculated. My impression is that this is due to the curvature of space which is velocity dependent.

Does this mean that a projectile passing the sun at close to the speed of light would be measured as being gravitationally accelerated at almost twice the value that Newtonian gravity would predict?

Put another way, would it also mean that a slow moving body would experience a weaker gravity than a fast moving body?
 
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Zman said:
Einstein calculated that the bending of light around a body is twice the value that Newton calculated. My impression is that this is due to the curvature of space which is velocity dependent.

Does this mean that a projectile passing the sun at close to the speed of light would be measured as being gravitationally accelerated at almost twice the value that Newtonian gravity would predict?

Put another way, would it also mean that a slow moving body would experience a weaker gravity than a fast moving body?

http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=AJPIAS000053000007000661000001&idtype=cvips&gifs=yes&ref=no paper should answer your question exactly.
 
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starthaus said:
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=AJPIAS000053000007000661000001&idtype=cvips&gifs=yes&ref=no paper should answer your question exactly.

To which I linked in post #2.
 
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Thanks, the abstract of the paper did answer my question. I'm also amazed that you were able to relate my question to that paper.

It is not required but it would have been nice to have browsed the whole paper.

Thanks
Zman
 

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