Is the graviton the only thing to find in LQG?

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The discussion explores the potential for discovering particles beyond gravitons within Loop Quantum Gravity (LQG), particularly as the theory approaches a classical limit. Participants consider whether Grand Unified Theories (GUTs) might emerge from LQG and emphasize the importance of observable consequences, such as effects from cosmological bounces or gamma-ray bursts. The conversation also touches on the conceptual implications of LQG, including the idea of a compact phase space and discrete geometry, which could redefine our understanding of spacetime and quantum fields. There is skepticism about the direct observability of gravitons and the challenges in predicting particle behavior in curved spacetime. Overall, the dialogue suggests a need for deeper conceptual exploration of LQG's implications for fundamental physics.
  • #31
sshai45 said:
I'm curious about this: how does the existence of this "surface" layer jive with Relativity's idea that there is no absolute "present"? Wouldn't that mean different observers would disagree on how the "heap" has grown?
In my view it certainly does. The "evolving surface layer" is a quantum version of a 3+1 foliation in GR, associated with a class of observers.

Also of course the view of "a present" or "the passage of time" is, here as in GR, a matter of perspective, one can equally well adopt the "unchanging spacetime" viewpoint.
 
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I enjoyed reading this thread.
 

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