Quantum Stress Tensor Fluctuations and Raychaudhuri's Equation

Physics

Scientific paper

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Scientific paper

The quantum fluctuations of the stress tensor of matter fields lead to fluctuations of the spacetime geometry. One way in which these fluctuations might manifest themselves is through expansion fluctuations of the rays from a distant object viewed through the fluctuating spacetime. We discuss this issue by using the Raychaudhuri equation as a Langevin equation. Some explicit results for the case of a thermal bath are presented.

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