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The cosmological backreaction: gauge (in)dependence, observers and scalars

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arxiv 1011.4921 v3 pith:CMECVOU6 submitted 2010-11-22 gr-qc astro-ph.COhep-th

Giovanni Marozzi This is my paper · ORCID
classification gr-qcastro-ph.COhep-th
keywords gaugedependencedifferentobserversaveragesaveragingbackreactioncosmological
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We discuss several issues related to a recent proposal for defining classical spatial averages to be used in the so-called cosmological backreaction problem. In the large averaging-volume limit all gauge dependence disappears and different averages can be univocally characterized by the observers associated with different scalar fields. The relation between such averaging procedure and the standard one is emphasized and a gauge invariant way to select different observers is presented. For finite averaging volumes we show that, within our proposal, a residual gauge dependence is left, but is suppressed by several effects.

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Cited by 1 Pith paper

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  1. Tensor-Induced Backreaction in Ultra-Slow-Roll Inflation

    astro-ph.CO 2026-08 conditional novelty 6.0 of 10

    Tensor-induced backreaction in ultra-slow-roll inflation limits the drop of the first slow-roll parameter and suppresses the curvature power spectrum peak from roughly 10^-3 to about 4x10^-6, strongly reducing primord...

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