How does LQG describe gravity?

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SUMMARY

The discussion centers on the relationship between spinfoams, spin networks, and gravity within the framework of Loop Quantum Gravity (LQG). Participants highlight that while spinfoams and spin networks can describe the structure of spacetime, the connection to gravity remains unclear. The conversation emphasizes that gravity, in the context of General Relativity (GR), is fundamentally linked to the geometry of spacetime, which is not directly embedded in classical spacetime. The need for a deeper understanding of how these quantum structures relate to gravitational phenomena is evident.

PREREQUISITES
  • Understanding of Loop Quantum Gravity (LQG)
  • Familiarity with spinfoams and spin networks
  • Knowledge of General Relativity (GR) and its principles
  • Basic concepts of geometry in the context of physics
NEXT STEPS
  • Research the role of spinfoams in Loop Quantum Gravity
  • Study the implications of spin networks on spacetime geometry
  • Explore the relationship between geometry and gravity in General Relativity
  • Investigate alternative theories of quantum gravity
USEFUL FOR

This discussion is beneficial for theoretical physicists, researchers in quantum gravity, and students studying the intersection of quantum mechanics and general relativity.

Heidi
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I can see how spinfoams and spin networks can describe the structure of space and time. But i have not seen what is added so that there is gravity. is it a less action principle?u
 
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Heidi said:
But i have not seen what is added so that there is gravity.

What is gravity in the context of classical GR?
 
In GR we have an equality relating the geometry and the energy momentum it cotains. so we get geodesics and derivatives.
Here the networks are not embedded in the classical space time.
 
Heidi said:
Here the networks are not embedded in the classical space time.

Well, in a way they constitute spacetime. And since gravity can be thought of as geometry of spacetime, and since you've said that you see how spinfoams and networks are related to spacetime, then I guess that would mean that you should see how they are related to gravity :tree:
 
I asked the question because i did not succeed. Did you?
 

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