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arXiv 0903.2142math.DGmath.AP
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里奇曲率有界的非塌陷三维流形的里奇流

Ricci flow of non-collapsed 3-manifolds whose Ricci curvature is bounded from below

Miles Simon

摘要:

考虑完备(可能非紧)三维黎曼流形(M,g)使得:a)(M,g)是非塌缩的,b)(M,g)的里奇曲率是下有界的,c)(M,g)在无穷远处的几何不太极端.给定这样的初始数据(M,g),我们表明,一个里奇流存在一个很短的时间间隔。这使我们能够构造任何(可能是奇异的)度量空间(X,d)的里奇流,它作为一致满足a),b)和c)的3-流形序列的Gromov-Hausdorff极限而出现。作为推论,我们证明了这样的X一定是流形。

英文摘要:

We consider complete (possibly non-compact) three dimensional Riemannian manifolds (M,g) such that: a) (M,g) is non-collapsed, b) the Ricci curvature of (M,g) is bounded from below, c) the geometry of (M,g) at infinity is not too extreme. Given such initial data (M,g) we show that a Ricci flow exists for a short time interval. This enables us to construct a Ricci flow of any (possibly singular) metric space (X,d) which arises as a Gromov-Hausdorff limit of a sequence of 3-manifolds which satisfy a), b) and c) uniformly. As a corollary we show that such an X must be a manifold.

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