Equatorial circular orbits in the Kerr-de Sitter spacetimes

TL;DR

This paper analyzes equatorial circular orbits of test particles in Kerr-de Sitter spacetimes, exploring their properties in black-hole and naked-singularity cases and their implications for thin accretion discs.

Contribution

It provides a detailed determination and discussion of circular orbits in Kerr-de Sitter spacetimes, including their relevance to accretion disc models.

Findings

Circular orbits are characterized for both black-hole and naked-singularity spacetimes.

The properties of these orbits are linked to the stability and structure of accretion discs.

Implications for astrophysical phenomena involving Kerr-de Sitter spacetimes are discussed.

Abstract

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.