Semiclassical approximations for gravity and the issue of backreaction

Details Semiclassical approximations for gravity and the issue of backreaction Semiclassical approximations for gravity and the issue of backreaction

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989cqgra...6..533p&link_type=abstract

Classical and Quantum Gravity (ISSN 0264-9381), vol. 6, April 1, 1989, p. 533-555.

Physics

34

Field Theory (Physics), Gravitation Theory, Quantum Mechanics, Space-Time Functions, Born-Oppenheimer Approximation, Degrees Of Freedom, Einstein Equations, Hamiltonian Functions, Schroedinger Equation

Scientific paper

Semisclassical approximations for studying the interaction between a quantum system and a classical system are examined, using a toy quantum mechanical model with two degrees of freedom. The Born-Oppenheimer Approximation (BOA) and the effective action approach are studied. It is shown that there is no backreaction on gravity in the strict BOA limit. In the effective action approach, a semiclassical description for gravity may be obtained if certain stringent requirements are satisfied.

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