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http://arxiv.org/abs/gr-qc/0703097

New directions in Background Independent Quantum Gravity

Fotini Markopoulou

Perimeter Institute for Theoretical Physics

Good stuff.Summary and Conclusions

One can start with a pre-geometric theory and look for the effective coherent degrees of freedom

along the lines described. Spacetime is to be inferred by them internally, namely, using only operations that are accessible to parts of the system. This is very promising for three reasons:

1) The emphasis on the effective coherent degrees of freedom addresses directly and in fact uses the dynamics. The dynamics is physically essential but almost impossible to deal with in other approaches.

2) A truly effective spacetime has novel phenomenological implications not tied to the Planck scale which can be tested and rejected if wrong.

3) A pre-spacetime background independent quantum theory of gravity takes us away from the concept of a quantum superposition of spacetimes which can be easily written down formally but has been impossible to make sense of physically in any approach other than Causal Dynamical Triangulations.

How influential is Fotini Markopoulou?

Is anybody going to listen?

jal