2007/11/30 by Joseph Samuel, Sutirtha Roy Chowdhury
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Geometric Analysis and Curvature Flows #gr-qc
paper · pdf · doi:10.1088/0264-9381/25/3/035012
published as Class.Quant.Grav.25:035012,2008 · 24 pages, two figures, paper improved in response to referees' comments, to appear in Classical and Quantum Gravity
arxiv created 2007/12/18 · openalex publication_date 2008/01/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
The Ricci flow (RF) is a heat equation for metrics, which has recently been used to study the topology of closed three-manifolds. In this paper we apply Ricci flow techniques to general relativity. We view a three-dimensional asymptotically flat Riemannian metric as a time symmetric initial data set for Einstein's equations. We study the evolution of the area and Hawking mass of a two-dimensional closed surface under the Ricci flow. The physical relevance of our study derives from the fact that in general relativity the area of apparent horizons is related to black hole entropy and the Hawking mass of an asymptotic round 2-sphere is the ADM energy. We begin by considering the special case of spherical symmetry to develop a physical feel for the geometric quantities involved. We then consider a general asymptotically flat Riemannian metric and derive an inequality which relates the evolution of the area of a closed surface S to its Hawking mass. We suggest that there may be a maximum principle which governs the long-term existence of the asymptotically flat Ricci flow.