Is Minisuperspace Quantum Gravity Reliable?

Details Is Minisuperspace Quantum Gravity Reliable? Is Minisuperspace Quantum Gravity Reliable?

2001-01-27

arxiv.org/abs/gr-qc/0101108v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Scientific paper

We study a minisuperspace quantum cosmology for a 2+1 dimensional de Sitter universe and find the wave function both exactly and in WKB approximation. Then we extend the model to a canonically quantized field theory for quantum gravity, i.e., a midisuperspace, and obtain the wave functional of the resulting field theory in the saddle point approximation. It is shown that these two approaches yield different results.

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