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On the Back Reaction Problem for Gravitational Perturbations

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arxiv gr-qc/9609026 v1 pith:5Y7BEYSS submitted 1996-09-10 gr-qc astro-phhep-th

V. Mukhanov (ETH Zuerich) , L.R.W. Abramo (Brown Univ.) , R. Brandenberger (Brown Univ.) This is my paper
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We derive the effective energy-momentum tensor for cosmological perturbations and prove its gauge-invariance. The result is applied to study the influence of perturbations on the behaviour of the Friedmann background in inflationary Universe scenarios. We found that the back reaction of cosmological perturbations on the background can become important already at energies below the self-reproduction scale.

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  1. Measurements in stochastic gravity and thermal variance

    gr-qc 2025-06 conditional novelty 6.0 of 10

    Thermal photon fluctuations in a curved spacetime generate metric variance that, in the Fewster-Verch measurement scheme, equals the stochastic gravity noise kernel exactly.

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