The Effects of Stress Tensor Fluctuations upon Focusing

Details The Effects of Stress Tensor Fluctuations upon Focusing The Effects of Stress Tensor Fluctuations upon Focusing

2003-07-10

arxiv.org/abs/gr-qc/0307043v2

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.

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