B Gravitons: Relationship to Space-Time & Black Holes

[Kairos]

1) What is the relationship between gravitons and the curvature of space-time?
2) As gravitons move at speed c, the curvature of space-time is not instantaneous either, so how the curvature sets in or disappears gradually (for theoretical example if mass disappears suddenly upon collision of matter and antimatter stars)
3) How gravitons, contrary to light photons, can escape black holes and thus from the space-time trap that they are supposed to create themselves?
4) What experimental or theoretical observation has necessitated to postulate the existence of these interaction particles?

 

[Kairos]

I just saw under my question that the subject has already been addressed, I will read the old answers...

 

[PeroK]

1) What is the relationship between gravitons and the curvature of space-time?
2) As gravitons move at speed c, the curvature of space-time is not instantaneous either, so how the curvature sets in or disappears gradually (for theoretical example if mass disappears suddenly upon collision of matter and antimatter stars)
3) How gravitons, contrary to light photons, can escape black holes and thus from the space-time trap that they are supposed to create themselves?
4) What experimental or theoretical observation has necessitated to postulate the existence of these interaction particles?

1) Gravitons are a hypothetical particle that mediate the gravitational interaction in theories of quantum gravity.

2) Spacetime curvature is caused by stress-energy, which is a conserved quantity. E.g. if a particle and anti-particle annihilate, then energy is conserved, even if particle rest mass is not.

3) They don't "escape black holes". This seems to be a common misconception. There are several thread on this.

4) The other fundamental interactions have a mediator particle. That's the role the graviton would play.

 

[Kairos]

thanks for your corrections on points 2 and 3!
do quantum gravity theories connect space-time curvature and gravitons?

 

[PeroK]

thanks for your corrections on points 2 and 3!
do quantum gravity theories connect space-time curvature and gravitons?

How GR and curved spacetime emerges from a theory of QG varies depending on the particular theory of QG. This page gives an introduction and a list of candidate theories:

https://en.wikipedia.org/wiki/Quantum_gravity