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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Ricci-flat manifold ： ウィキペディア英語版 Ricci-flat manifold In mathematics, Ricci-flat manifolds〔Dictionary of Distances By Michel-Marie Deza, Elena Deza. Elsevier, Nov 16, 2006. Pg 87〕〔Arthur E. Fischer and Joseph A. Wolf, (The structure of compact Ricci-flat Riemannian manifolds ). J. Differential Geom. Volume 10, Number 2 (1975), 277-288.〕 are Riemannian manifolds whose Ricci curvature vanishes. In physics, they represent vacuum solutions to the analogues of Einstein's equations for Riemannian manifolds of any dimension, with vanishing cosmological constant. Ricci-flat manifolds are special cases of Einstein manifolds, where the cosmological constant need not vanish. Since Ricci curvature measures the amount by which the volume of a small geodesic ball deviates from the volume of a ball in Euclidean space, small geodesic balls will have no volume deviation, but their "shape" may vary from the shape of the standard ball in Euclidean space. For example, in a Ricci-flat manifold, a circle in Euclidean space may be deformed into an ellipse with equal area. This is due to Weyl curvature. Ricci-flat manifolds often have restricted holonomy groups. Important cases include Calabi–Yau manifolds and hyperkähler manifolds. ==Further reading== * Matthew Randall, ''Almost Projectively Ricci-flat Manifolds'', Dept. of Mathematics, University of Auckland, 2010. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ricci-flat manifold」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.