Notes on semiclassical gravity.

Details Notes on semiclassical gravity. Notes on semiclassical gravity.

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989anphy.196..296s&link_type=abstract

Ann. Phys. (N.Y.), Vol. 196, No. 2, p. 296 - 344

Physics

69

Quantum Gravity: Cosmology, Cosmology: Robertson-Walker Metric

Scientific paper

The authors investigate the different possible ways of defining the semiclassical limit of quantum general relativity. They develop rules for finding the back-reaction of the quantum mode q on the classical mode Q. They conclude that the back-reaction in semiclassical gravity is >Tik< only when the dispersion in the phase of the matter wavefunctional can be neglected. This conclusion is highlighted with a minisuperspace example of a massless scalar field in a Robertson-Walker universe. They use the semiclassical theory to show that the minisuperspace approximation in quantum cosmology is valid only if the production of gravitons is negligible.

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