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RESEARCH PRODUCT
Bimetric truncations for quantum Einstein gravity and asymptotic safety
Martin ReuterElisa Manriquesubject
High Energy Physics - TheoryPhysicsAsymptotic safety in quantum gravityFOS: Physical sciencesGeneral Physics and AstronomyGeneral Relativity and Quantum Cosmology (gr-qc)Cosmological constantGeneral Relativity and Quantum CosmologyRenormalizationGravitationHigh Energy Physics - Theory (hep-th)Quantum gravityBackground independenceCosmological constant problemMathematical physicsGauge fixingdescription
In the average action approach to the quantization of gravity the fundamental requirement of "background independence" is met by actually introducing a background metric but leaving it completely arbitrary. The associated Wilsonian renormalization group defines a coarse graining flow on a theory space of functionals which, besides the dynamical metric, depend explicitly on the background metric. All solutions to the truncated flow equations known to date have a trivial background field dependence only, namely via the classical gauge fixing term. In this paper we analyze a number of conceptual issues related to the bimetric character of the gravitational average action and explore a first nontrivial bimetric truncation in the simplified setting of conformally reduced gravity. Possible implications for the Asymptotic Safety program and the cosmological constant problem are discussed in detail.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-04-01 | Annals of Physics |