Running Immirzi Parameter and Asymptotic Safety

Details Running Immirzi Parameter and Asymptotic Safety Running Immirzi Parameter and Asymptotic Safety

2011-11-03

arxiv.org/abs/1111.1000v1

Physics

High Energy Physics

High Energy Physics - Theory

To appear in the proceedings of CORFU 2010

Scientific paper

We explore the renormalization group (RG) properties of quantum gravity, using the vielbein and the spin connection as the fundamental field variables. We require the effective action to be invariant under the semidirect product of spacetime diffeomorphisms and local frame rotations. Starting from the corresponding functional integral we review the construction of an appropriate theory space and an exact funtional RG equation operating on it. We then solve this equation on a truncated space defined by a three parameter family of Holst-type actions which involve a running Immirzi parameter. We find evidence for the existence of an asymptotically safe fundamental theory. It is probably inequivalent to metric quantum gravity constructed in the same way.

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