Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2003-07-10
Phys.Rev. D70 (2004) 064032
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
26 pages, 1 figure, new material added in Sect. III and in Appendices B and C
Scientific paper
10.1103/PhysRevD.70.064032
We treat the gravitational effects of quantum stress tensor fluctuations. An operational approach is adopted in which these fluctuations produce fluctuations in the focusing of a bundle of geodesics. This can be calculated explicitly using the Raychaudhuri equation as a Langevin equation. The physical manifestation of these fluctuations are angular blurring and luminosity fluctuations of the images of distant sources. We give explicit results for the case of a scalar field on a flat background in a thermal state.
Borgman Jacob
Ford L. H.
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