Equatorial circular orbits in the Kerr-de Sitter spacetimes

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Equatorial motion of test particles in the Kerr-de Sitter spacetimes is considered. Circular orbits are determined, their properties are discussed for both the black-hole and naked-singularity spacetimes, and their relevance for thin accretion discs is established.
24 pages, 19 figures, REVTeX 4

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