


ID:
286214.0,
MPI für Gravitationsphysik / Quantum Gravity and Unified Theories 
Algebraic Quantum Gravity (AQG) I. Conceptual Setup 
Authors:  Giesel, Kristina; Thiemann, Thomas  Date of Publication (YYYYMMDD):  2007  Title of Journal:  Classical and Quantum Gravity  Volume:  24  Issue / Number:  10  Start Page:  2465  End Page:  2497  Review Status:  not specified  Audience:  Not Specified  Abstract / Description:  We introduce a new top down approach to canonical quantum gravity, called Algebraic Quantum Gravity (AQG):The quantum kinematics of AQG is determined by an abstract $*$algebra generated by a countable set of elementary operators labelled by an algebraic graph. The quantum dynamics of AQG is governed by a single Master Constraint operator. While AQG is inspired by Loop Quantum Gravity (LQG), it differs drastically from it because in AQG there is fundamentally no topology or differential structure. A natural Hilbert space representation acquires the structure of an infinite tensor product (ITP) whose separable strong equivalence class Hilbert subspaces (sectors) are left invariant by the quantum dynamics. The missing information about the topology and differential structure of the spacetime manifold as well as about the background metric to be approximated is supplied by coherent states. Given such data, the corresponding coherent state defines a sector in the ITP which can be identified with a usual QFT on the given manifold and background. Thus, AQG contains QFT on all curved spacetimes at once, possibly has something to say about topology change and provides the contact with the familiar low energy physics. In particular, in two companion papers we develop semiclassical perturbation theory for AQG and LQG and thereby show that the theory admits a semiclassical limit whose infinitesimal gauge symmetry agrees with that of General Relativity. In AQG everything is computable with sufficient precision and no UV divergences arise due to the background independence of the undamental combinatorial structure. Hence, in contrast to lattice gauge theory on a background metric, no continuum limit has to be taken, there simply is no lattice regulator that must be sent to zero.  External Publication Status:  published  Document Type:  Article 
Communicated by:  Hermann Nicolai  Affiliations:  MPI für Gravitationsphysik/Quantum Gravity and Unified Theories
 Identifiers:  LOCALID:arXiv:grqc/0607099 DOI:10.1088/02649381/24/10/003 
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