1989
DOI: 10.1103/physrevd.39.2436
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Time in semiclassical gravity

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Cited by 126 publications
(215 citation statements)
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“…Subsequently the approach was further analysed in order to justify the use of the mean matter energy to drive gravitation [14]. This was found to be true when non-adiabatic transitions (fluctuations) are negligible and the Universe is sufficiently far from the Planck scale.…”
Section: Introductionmentioning
confidence: 99%
“…Subsequently the approach was further analysed in order to justify the use of the mean matter energy to drive gravitation [14]. This was found to be true when non-adiabatic transitions (fluctuations) are negligible and the Universe is sufficiently far from the Planck scale.…”
Section: Introductionmentioning
confidence: 99%
“…[9], but here we want to employ the more systematic Born-Oppenheimer approach (see, for instance, Ref. [7,16]). First of all, we assume that the complete wavefunction factorizes into "gravitational" (ψ) and "matter" (χ) parts,…”
mentioning
confidence: 99%
“…Another method is to impose a large (space-time) symmetry prior to quantization, resulting in a so called mini-(or midi-) superspace for a finite (or discrete) number of canonical variables [5,6]. In the latter approach to quantum gravity there is no time and one expects that a time variable can be identified by resorting to the semiclassical approximation [7].…”
mentioning
confidence: 99%
“…The above approach has been examined in detail within the context of a minisuperspace model with matter [5] with the view of understanding under what conditions matter follows gravity adiabatically and quantum cosmology leads to the usual physics (Schrodinger equation for matter and Einstein classical equations for gravity on scales larger than the Planckian). It was found that such w as the case in an in ationary scenario [7] and after ten or more Planck times the usual physics ensues.…”
mentioning
confidence: 99%
“…We n o w follow a procedure analogous to the one illustrated elsewhere [5] [ 6 ] and factorize the wave function as: (a ; f a n g ; f b n g ; ; f f n g ) = Y nñ ( a ; a n ; b n ; ; f n ) n ( a ; a n ;…”
mentioning
confidence: 99%