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Note on Legendre decomposition of the Pontryagin density in Kerr

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arxiv 1407.0744 v1 pith:576OY3YT submitted 2014-07-02 gr-qc

Note on Legendre decomposition of the Pontryagin density in Kerr

classification gr-qc
keywords decompositionlegendrepolynomialsblackchern-simonsdensityfieldfunctions
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In arXiv:1406.0957v1 ("Scalar field excited around a rapidly rotating black hole in Chern-Simons modified gravity"), Konno and Takahashi have recently developed some analytical results for the scalar field about a Kerr black hole in the decoupling limit of dynamical Chern-Simons gravity. This involved a decomposition of the source (the Pontryagin density) in terms of Legendre polynomials. Here we give a two-line expression for this decomposition which simplifies their quadruple sum. Our expressions are rational polynomials multiplying Legendre functions of the second kind, or equivalently rational polynomials multiplying hypergeometric functions.

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