Classical Spacetime from Quantum Gravity

Details Classical Spacetime from Quantum Gravity Classical Spacetime from Quantum Gravity

1996-01-31

arxiv.org/abs/gr-qc/9601049v2

Class.Quant.Grav. 13 (1996) 1377-1382

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, ReVTeX, No Figures

Scientific paper

10.1088/0264-9381/13/6/011

We show how classical spacetime emerges from quantum gravity through the study of a quantum FRW cosmological model coupled to a free massive scalar field using a new asymptotic expansion method of the Wheeler-DeWitt equation. It is shown that the coherent states of the nonadiabatic basis of a particular generalized invariant give rise to the quantum back reaction of matter field proportional to classical energy and the Einstein-Hamilton-Jacobi with matter becomes equivalent to the classical Einstein equation.

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