Loop Quantum Gravity and Cosmology: A dynamical introduction

Details Loop Quantum Gravity and Cosmology: A dynamical introduction Loop Quantum Gravity and Cosmology: A dynamical introduction

2011-01-28

arxiv.org/abs/1101.5592v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

45 pages, 1 figure, based on a talk presented at the workshop "Foundations of Space and Time - Reflections on Quantum Gravity"

Scientific paper

Loop quantum gravity and cosmology are reviewed with an emphasis on evaluating the dynamics, rather than constructing it. The three crucial parts of such an analysis are (i) deriving effective equations, (ii) controlling the theory's microscopic degrees of freedom that lead to its spatial discreteness and refinement, and (iii) ensuring consistency and anomaly-freedom. All three issues are crucial for making the theory testable by conceptual and observational means, and they remain challenging. Throughout this review, the Hamiltonian nature of the theory will play a large role for properties of space-time structure within the framework discussed.

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