Gauge Issues in Extended Gravity and f(R) Cosmology
General Relativity and Quantum Cosmology
2015-06-03 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
Abstract
We consider issues related to the conformal mapping between the Einstein and Jordan frames in f(R) cosmology. We consider the impact of the conformal transformation on the gauge of a perturbed system and show that unless the system is written in a restricted set of gauges the mapping could produce an inconsistent result in the target frame. Newtonian gauge lies within the restricted group but synchronous gauge does not. If this is not treated carefully it could in principle contaminate numerical calculations.
Keywords
Cite
@article{arxiv.1112.0575,
title = {Gauge Issues in Extended Gravity and f(R) Cosmology},
author = {Iain A. Brown and Amir Hammami},
journal= {arXiv preprint arXiv:1112.0575},
year = {2015}
}
Comments
12 pages, REVTeX4. Replaced with version accepted by JCAP. Citations added and some clarifications