Comments on gauge-invariance in cosmology
Cosmology and Nongalactic Astrophysics
2013-08-09 v4 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
We revisit the gauge issue in cosmological perturbation theory, and highlight its relation to the notion of covariance in general relativity. We also discuss the similarities and differences of the covariant approach in perturbation theory to the Bardeen or metric approach in a non-technical fashion.
Cite
@article{arxiv.1206.1478,
title = {Comments on gauge-invariance in cosmology},
author = {Karim A. Malik and David R. Matravers},
journal= {arXiv preprint arXiv:1206.1478},
year = {2013}
}
Comments
7 pages, 1 figure, revtex4; v3: minor changes, typos corrected, discussion extended; v4: typos corrected, corresponding to published version