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 in | Classical and quantum gravity Vol. 27; no. 14; p. 145004 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Bristol
IOP Publishing
21.07.2010
Institute of Physics |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0264-9381 1361-6382 |
| DOI | 10.1088/0264-9381/27/14/145004 |
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| Abstract | 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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| AbstractList | 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. |
| Author | Bojowald, Martin Tsobanjan, Artur |
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| Cites_doi | 10.1142/S0129055X09003591 10.1103/RevModPhys.21.400 10.1103/PhysRevLett.22.1071 10.1007/978-3-642-97306-2 10.1103/PhysRevD.75.123512 10.1103/PhysRevD.75.081301 10.1007/s10714-008-0645-1 10.1103/PhysRevD.80.125008 10.1103/PhysRevD.56.6247 10.1142/S0129055X06002772 10.1007/s00220-004-1275-4 |
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| SubjectTerms | Coherence Cosmology Exact sciences and technology General relativity and gravitation Mathematical models Physics Quantum gravity Strength |
| Title | Effective constraints and physical coherent states in quantum cosmology: a numerical comparison |
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