Noise kernels of stochastic gravity in conformally-flat spacetimes

Abstract

The central object in the theory of semiclassical stochastic gravity is the noise kernel which is the symmetric two point correlation function of the stress-energy tensor. Using the corresponding Wightman functions in Minkowski, Einstein and open Einstein spaces, we construct the noise kernels of a conformally coupled scalar field in these spacetimes. From them we show that the noise kernels in conformally-flat spacetimes, including the Friedmann-Robertson-Walker universes, can be obtained in closed analytic forms by using a combination of conformal and coordindate transformations.

18 pages, no figures

References in corpus (3)

• Riemann correlator in de Sitter including loop corrections from conformal fields
• Cosmological perturbations from stochastic gravity
• Metric fluctuations of an evaporating black hole from back reaction of stress tensor fluctuations

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• Conformally-related Einstein-Langevin equations for metric fluctuations in stochastic gravity