Back Reaction of Cosmological Perturbations
@article{Brandenberger2000BackRO, title={Back Reaction of Cosmological Perturbations}, author={Robert Brandenberger}, journal={arXiv: High Energy Physics - Theory}, year={2000}, pages={198-206} }
The presence of cosmological perturbations affects the background metric and matter configuration in which the perturbations propagate. This effect, studied a long time ago for gravitational waves, also is operational for scalar gravitational fluctuations, inhomogeneities which are believed to be more important in inflationary cosmology. The back-reaction of fluctuations can be described by an effective energy-momentum tensor. The issue of coordinate invariance makes the analysis more…
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