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Title: Energy, entropy and the Ricci flow
Authors: Samuel, J.
Roy Chowdhury, Sutirtha
Issue Date: Jan-2008
Publisher: Institute of Physics Publishing (IOP)
Citation: Classical and Quantum Gravity, 2008, Vol.25, 035012
Abstract: 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 {\cal A} and Hawking mass {\cal M}_H 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 \frac{{\rm d}}{{\rm d}\tau}{\cal A}^{3/2}\le -24\pi^{3/2} {\cal M}_H 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.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: E-ISSN: 1361-6382
P-ISSN: 0264-9381
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Copyright: 2008 IOP Publishing
Appears in Collections:Research Papers (TP)

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