Gauge invariant averages for the cosmological backreaction
M. Gasperini, G. Marozzi, G. Veneziano
TL;DR
This paper develops gauge invariant methods for averaging in cosmology, ensuring accurate evaluation of backreaction effects without interpretation issues.
Contribution
It introduces gauge invariant prescriptions for classical and quantum averages, improving the reliability of backreaction analysis in cosmology.
Findings
Gauge invariant prescriptions prevent interpretation problems.
Examples demonstrate the effectiveness of the approach.
Enhances accuracy of backreaction effect evaluations.
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.
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