Loop quantum cosmology: I. Kinematics

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Abstract

The framework of quantum symmetry reduction is applied to loop quantum gravity with respect to transitively acting symmetry groups. This allows us to test loop quantum gravity in a large class of minisuperspaces and to investigate its features - e.g. the discrete volume spectrum - in certain cosmological regimes. Contrary to previous studies of quantum cosmology (minisuperspace quantizations) the symmetry reduction is carried out not at the classical level but on an auxiliary Hilbert space of the quantum theory before solving the constraints. Therefore, kinematical properties like volume quantization survive the symmetry reduction. In this first part of a series of papers the kinematical framework, i.e. implementation of the quantum symmetry reduction and quantization of Gauß and diffeomorphism constraints, is presented for Bianchi class A models as well as locally rotationally symmetric and spatially isotropic closed and flat models.

Original languageEnglish (US)
Pages (from-to)1489-1508
Number of pages20
JournalClassical and Quantum Gravity
Volume17
Issue number6
DOIs
StatePublished - Mar 21 2000

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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