Where does a photon distort spacetime?

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    Photon Spacetime
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Discussion Overview

The discussion revolves around the effects of a photon on spacetime, particularly focusing on how a low-energy photon might distort spacetime as it moves. Participants explore the visualization of these effects and the implications of measuring the gravitational influence of a single photon.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions how spacetime is affected by a low-energy photon and whether its gravitational effect would follow the shape of the wave as it travels.
  • Another participant references an old thread for additional context but does not provide specific insights into the current discussion.
  • A participant notes the absence of a quantum theory of gravity and suggests discussing classical light pulses instead, mentioning pp-wave spacetimes as a relevant concept.
  • Another participant acknowledges the complexity of the question and provides links to external resources, including pp-wave spacetimes and illustrations of gravitational waves, while cautioning that these may not directly address the original query.

Areas of Agreement / Disagreement

Participants do not reach a consensus, as there are multiple competing views regarding the nature of photons and their interaction with spacetime, and the discussion remains unresolved.

Contextual Notes

The discussion highlights the limitations of current understanding, particularly the lack of a quantum theory of gravity and the challenges in visualizing the effects of photons on spacetime.

foolish1
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Lets say I have a very low energy photon moving through space and I want to visualize how space-time is effected by the motion of the photon thru space.

Photons are supposed to be quantized.. If it were possible to build a machine to measure the "gravitational" effect of a single photon would it follow the shape of the wave at each point as it traveled thru space? Would it deform the whole region of the packet? What would it look like if you drew it out?
 
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We don't have a quantum theory of gravity yet. However, if you are willing to discuss classical pulses of light instead of photons then you should look into pp-wave spacetimes.
 

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