Gauge invariant averages for the cosmological backreaction

2009/01/31 by M. Gasperini, Giovanni Marozzi, G. Marozzi +1 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Relativity and Gravitational Theory #astro-ph.CO #gr-qc #hep-th

paper · pdf · doi:10.1088/1475-7516/2009/03/011

published as JCAP 0903:011,2009 · 21 pages, no figures. Comments and references added, typos corrected. Small corrections and reference added, matches version published in JCAP

openalex publication_date 2009/03/06 · arxiv created 2009/03/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

We show how to provide suitable gauge invariant prescriptions for the classical spatial averages (resp. quantum expectation values) that are needed in the evaluation of classical (resp. quantum) backreaction effects. We also present examples illustrating how the use of gauge invariant prescriptions can avoid interpretation problems and prevent misleading conclusions.

Citations

• Back-Reaction of Cosmological Perturbations in the Infinite Wavelength Approximation
• Energy-momentum tensor of cosmological fluctuations during inflation
• Backreaction of Cosmological Fluctuations during Power-Law Inflation
• Cosmological long wavelength perturbations
• Non-Gaussianity from the second-order cosmological perturbation

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• Applicability of the linearly perturbed FRW metric and Newtonian cosmology