Effective constraints and physical coherent states in quantum cosmology: a numerical comparison

A cosmological model with a cyclic interpretation is introduced, which is subject to quantum back-reaction and yet can be treated rather completely by physical coherent states as well as effective constraint techniques. By this comparison, the role of quantum back-reaction in quantum cosmology is un...

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Published inClassical and quantum gravity Vol. 27; no. 14; p. 145004
Main Authors Bojowald, Martin, Tsobanjan, Artur
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 21.07.2010
Institute of Physics
Subjects
Coherence
Cosmology
Exact sciences and technology
General relativity and gravitation
Mathematical models
Physics
Quantum gravity
Strength
Cosmology
Coherent states
Cosmological models
Online AccessGet full text
ISSN0264-9381
1361-6382
DOI10.1088/0264-9381/27/14/145004

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Summary:A cosmological model with a cyclic interpretation is introduced, which is subject to quantum back-reaction and yet can be treated rather completely by physical coherent states as well as effective constraint techniques. By this comparison, the role of quantum back-reaction in quantum cosmology is unambiguously demonstrated. Also the complementary nature of strengths and weaknesses of the two procedures is illustrated. Finally, effective constraint techniques are applied to a more realistic model filled with radiation, a context in which physical coherent states are not available.
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ISSN:0264-9381
1361-6382
DOI:10.1088/0264-9381/27/14/145004