Computer Science
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gregr..27..341p&link_type=abstract
General Relativity and Gravitation, Volume 27, Issue 3, pp.341-346
Computer Science
12
Scientific paper
In this essay we discuss an interesting recent development in semiclassical gravity. Using an improved Born-Oppenheimer approximation, the semiclassical reduction of the Wheeler-DeWitt equation turns out to give important insights into the nature and the level of validity of the semi-classical Einstein equations (SCEE). Back reactions from the quantized matter fields in SCEE are shown to be completely determined by adiabatically induced geometricU(N) gauge potentials. The finite energy from the vacuum polarization, in particular, is found to be intimately related to the ‘magnetic’ type geometric gauge potential. As a result the vacuum energy in a universe emerging from a ‘source-free’ flat simply-connected superspace is gauge equivalent to zero, leading to some dramatic consequences.
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