Loop Quantum Cosmology IV: Discrete Time Evolution

Details Loop Quantum Cosmology IV: Discrete Time Evolution Loop Quantum Cosmology IV: Discrete Time Evolution

2000-08-22

arxiv.org/abs/gr-qc/0008053v1

Class.Quant.Grav. 18 (2001) 1071-1088

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 pages

Scientific paper

10.1088/0264-9381/18/6/308

Using general features of recent quantizations of the Hamiltonian constraint in loop quantum gravity and loop quantum cosmology, a dynamical interpretation of the constraint equation as evolution equation is presented. This involves a transformation from the connection to a dreibein representation and the selection of an internal time variable. Due to the discrete nature of geometrical quantities in loop quantum gravity also time turns out to be discrete leading to a difference rather than differential evolution equation. Furthermore, evolving observables are discussed in this framework which enables an investigation of physical spectra of geometrical quantities. In particular, the physical volume spectrum is proven to equal the discrete kinematical volume spectrum in loop quantum cosmology.

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