On the behavior of causal geodesics on a Kerr-de Sitter spacetime

Abstract

We analyze the behavior of causal geodesics on a Kerr-de Sitter spacetime with particular emphasis on their completeness property. We set up an initial value problem (IVP) whose solutions lead to a global understanding of causal geodesics on these spacetime. Causal geodesics that avoid the rotation axis are complete except the ones that hit the ring-like curvature singularity and those that encounter the ring singularity are necessary equatorial ones. We also show the existence of geodesics that cross or lie on the rotation axis. The equations governing the latter family show the repulsive nature of the ring singularity. The results of this work show, that as far as properties of causal geodesics are concerned, Kerr-de Sitter spacetimes behave in a similar manner as the family of Kerr spacetimes.

arXiv comment24 pages, five figures

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• Logarithmic tail contributions to the energy function of circular compact binaries
• Construction of the Unruh State for a Real Scalar Field on the Kerr-de Sitter Spacetime
• Maximal Kerr de Sitter spacetimes
• Causality Aspects of Modified Kerr-Newman spacetimes
• Analytic Approximations in GR and Gravitational Waves
• On causality violation on a Kerr-de Sitter spacetime
• Exploring quantum fields in rotating black holes