Stress Tensor Fluctuations and Passive Quantum Gravity

Details Stress Tensor Fluctuations and Passive Quantum Gravity Stress Tensor Fluctuations and Passive Quantum Gravity

2001-02-13

arxiv.org/abs/gr-qc/0102063v2

Int.J.Theor.Phys. 42 (2003) 15-26

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages. Based on a talk given at the 5th Peyresq workshop. Revised version incorporates corrections in several expressions i

Scientific paper

The quantum fluctuation of the stress tensor of a quantum field are discussed, as are the resulting spacetime metric fluctuations. Passive quantum gravity is an approximation in which gravity is not directly quantized, but fluctuations of the spacetime geometry are driven by stress tensor fluctuations. We discuss a decomposition of the stress tensor correlation function into three parts, and consider the physical implications of each part. The operational significance of metric fluctuations and the possible limits of validity of semiclassical gravity are discussed.

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