Strings and gravitational time dilation

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Discussion Overview

The discussion revolves around the concept of gravitational time dilation within the framework of string theory. Participants explore how string theory, which posits gravity is mediated by particles rather than curved spacetime, can still account for the phenomenon of time dilation in strong gravitational fields.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions how string theory predicts gravitational time dilation if gravity is mediated by particles, specifically asking about the mechanism behind clocks slowing down in strong gravitational fields.
  • Another participant expresses surprise at the lack of responses, suggesting that string theorists may not have addressed gravitational time dilation adequately, or possibly argue that it does not occur in their framework.
  • A later reply proposes that the graviton, as described in string theory, couples to matter in a way that aligns with Einstein's field equations, implying that the absorption of gravitons would lead to time dilation consistent with general relativity.
  • One participant acknowledges the complexity of the explanation, indicating that it may be more of a description than a full explanation, reflecting the challenges in particle physics.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether string theory adequately explains gravitational time dilation. Multiple competing views remain regarding the relationship between string theory and the predictions of general relativity.

Contextual Notes

There are limitations in the discussion, such as the lack of detailed mechanisms for how gravitons would lead to time dilation and the dependence on interpretations of string theory and general relativity.

εllipse
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Is there an explanation for gravitational time dilation in string theory? String theorists say their equations can make the same predictions as general relativity, so I would assume string theory predicts gravitational time dilation, but how would that work? If gravity is no longer mediated by curved spacetime, but carried by a particle, why would clocks slow down in strong gravitational fields?
 
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I'm surprised there hasn't been a response to this yet. Is there as of yet no solution to this? I would have thought string theorists would have delt with this by now (especially since the popularized texts I've read have had so much information about general relativity, I would assume gravitational time dilation would be hard to overlook), but maybe not. Possibly string theorists would argue that there wouldn't be any gravitational time dilation after all?
 
εllipse said:
Is there an explanation for gravitational time dilation in string theory? String theorists say their equations can make the same predictions as general relativity, so I would assume string theory predicts gravitational time dilation, but how would that work? If gravity is no longer mediated by curved spacetime, but carried by a particle, why would clocks slow down in strong gravitational fields?

If you mean by what mechanism does the string graviton affect the clocks, I think this is the best we can do: the graviton is supposed to couple to matter in accordance with Einstein's field equations, and since they call for time dilation in a gravity well, the absorption of a graviton must do that too, and the more gravitons absorbed (deeper in the well) the more dilation must occur, according to Einstein's formula.

If you think that is just a description without an explanation, welcome to particle physics.
 
selfAdjoint said:
If you think that is just a description without an explanation, welcome to particle physics.
Ah, hmph. Thanks.
 

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