Conformal geodesics and the evolution of spacetimes with positive Cosmological constant

TL;DR

This paper develops a conformal geodesic-based gauge system to analyze the evolution of spacetimes with positive Cosmological constant, enabling stability analysis and insights into de Sitter-like and Schwarzschild-de Sitter spacetimes.

Contribution

It introduces a novel conformal Gaussian gauge framework using conformal geodesics for studying Einstein equations with positive Cosmological constant.

Findings

Established a symmetric hyperbolic system for evolution equations.

Proved Cauchy stability results for de Sitter-like spacetimes.

Analyzed the evolution near the conformal boundary of Schwarzschild-de Sitter spacetime.

Abstract

This article provides a discussion on the construction of conformal Gaussian gauge systems to study the evolution of solutions to the Einstein field equations with positive Cosmological constant. This is done by means of a gauge based on the properties of conformal geodesics. The use of this gauge, combined with the extended conformal Einstein field equations, yields evolution equations in the form of a symmetric hyperbolic system for which standard Cauchy stability results can be employed. This strategy is used to study the global properties of de Sitter-like spacetimes with constant negative scalar curvature. It is then adapted to study the evolution of the Schwarzschild-de Sitter spacetime in the static region near the conformal boundary. This review is based on Class. Quantum Grav. 38 145026 and Class. Quantum Grav. 40 145005.