Algebraic Quantum Gravity (AQG) I. Conceptual Setup

Abstract

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 $\ast -$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.

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Cited by in corpus (116)

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• Flipped spinfoam vertex and loop gravity
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• Gravity quantized
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• Quantum Cosmology from Group Field Theory Condensates: a Review
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• Algebraic Quantum Gravity (AQG) II. Semiclassical Analysis
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• Classical and Quantum Features of the Mixmaster Singularity
• Gauge-invariant coherent states for Loop Quantum Gravity I: Abelian gauge groups
• Algebraic Quantum Gravity (AQG) III. Semiclassical Perturbation Theory
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• Generalized Spinfoams
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• Hamiltonian operator for loop quantum gravity coupled to a scalar field
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• Imaginary action, spinfoam asymptotics and the 'transplanckian' regime of loop quantum gravity
• Dynamics for a 2-vertex Quantum Gravity Model
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• Polymer quantization of the free scalar field and its classical limit
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• Statistical Mechanics of Graphity Models
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• An embedding of loop quantum cosmology in (b, v) variables into a full theory context
• Polymer Parametrised Field Theory
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• Quantum gravity corrections to the matter dynamics in the presence of a reference fluid
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• General Formulation of Topos Many-Node Theory