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arxiv: gr-qc/0703069 · v1 · submitted 2007-03-12 · 🌀 gr-qc

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High-order gauge-invariant perturbations of a spherical spacetime

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classification 🌀 gr-qc
keywords perturbationsconstructgauge-invariantgeneralhigh-orderinvariantsspacetimespherical
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We complete the formulation of a general framework for the analysis of high-order nonspherical perturbations of a four-dimensional spherical spacetime by including a gauge-invariant description of the perturbations. We present a general algorithm to construct these invariants and provide explicit formulas for the case of second-order metric perturbations. We show that the well-known problem of lack of invariance for the first-order perturbations with l=0,1 propagates to increasing values of l for perturbations of higher order, owing to mode coupling. We also discuss in which circumstances it is possible to construct the invariants.

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