PERFECT FLUID PERTURBATIONS OF ROBERTSON-WALKER SPACETIMES
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Published:1994-03
Issue:01
Volume:03
Page:153-156
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ISSN:0218-2718
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Container-title:International Journal of Modern Physics D
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language:en
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Short-container-title:Int. J. Mod. Phys. D
Affiliation:
1. RGGR, Université Libre de Bruxelles, Campus Plaine, CP 231, 1050 Bruxelles, Belgium
Abstract
I report on recent work on perturbations of Robertson-Walker spacetimes using the Bardeen-Stewart variables to describe metric perturbations. The gauge freedom available in the formalism is larger than that arising purely from spacetime diffeomorphisms. The associated non-uniqueness and non-locality problems have a simple solution, but the extra gauge freedom must be taken into account to obtain deterministic linearized field equations. The linearized Einstein equation decouples into scalar, vector and tensor sectors; I write down and comment on the equations one obtains using as matter an isentropic perfect fluid.
Publisher
World Scientific Pub Co Pte Lt
Subject
Space and Planetary Science,Astronomy and Astrophysics,Mathematical Physics