Gauge Issues in Extended Gravity and f(R) Cosmology

Details Gauge Issues in Extended Gravity and f(R) Cosmology Gauge Issues in Extended Gravity and f(R) Cosmology

2011-12-02

arxiv.org/abs/1112.0575v2

JCAP 04 (2012) 002

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, REVTeX4. Replaced with version accepted by JCAP. Citations added and some clarifications

Scientific paper

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.

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