Perfect Fluid Perturbations of Robertson-Walker Spacetimes

Details Perfect Fluid Perturbations of Robertson-Walker Spacetimes Perfect Fluid Perturbations of Robertson-Walker Spacetimes

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ijmpd...3..153b&link_type=abstract

International Journal of Modern Physics D, Volume 3, Issue 01, pp. 153-156 (1994).

Physics

Scientific paper

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.

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