Perturbative approach in Loop Quantum Gravity

[Polyrhythmic]

I'm a novice in Loop Quantum Gravity, so please bear with me if this is a trivial question. As far as I know, LQG is usually formulated non-perturbatively, but is there also a perturbative approach in the sense that we use a series expansion in order to calculate vacuum expectation values? Are there Feynman diagrams? Does this even make sense?

[atyy]

The current efforts are along the lines of
http://arxiv.org/abs/0905.4082
http://arxiv.org/abs/1105.0566

It is still unclear how to think about many details:
http://arxiv.org/abs/1004.4550

And the existence of the full, non-perturbative theory is also unknown:
http://arxiv.org/abs/1010.5437

[Polyrhythmic]

Thank you, I will take a look into those papers!