Absorption rate of the Kerr-de Sitter black hole and the Kerr-Newman-de Sitter black hole

Abstract

By using an analytic solution of the Teukolsky equation in the Kerr-de Sitter and Kerr-Newman-de Sitter geometries, an analytic expression of the absorption rate formulae for these black holes is calculated.

11 pages, LaTeX. Several typos are corrected

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