Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-11-25
Class. Quantum Grav.27:145004, 2010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
32 pages, 25 figures
Scientific paper
10.1088/0264-9381/27/14/145004
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 state 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, where physical coherent states are not available.
Bojowald Martin
Tsobanjan Artur
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