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arXiv math/0506481math.DG
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弱曲率条件与泛函不等式

Weak curvature conditions and functional inequalities

John Lott, Cedric Villani

摘要:

给出了测度空间(X,d,m)中局部和整体Poincare不等式成立的充分条件.我们首先介绍一个条件DM(X,d,m),定义在运输的措施。我们发现,DM,随着一个加倍条件的m,意味着一个规模不变的局部庞加莱不等式。我们证明了如果(X,d,m)具有非负的N-里奇曲率,并且在几乎所有的点对之间具有唯一的极小化测地线,则它满足DM,且2 ^N为常数.条件DM由测量的Gromov-Hausdorff极限保持。然后证明了一个Sobolev不等式,其长度为N-里奇曲率,K>0。最后,我们证明了一个尖锐的全球不平等。

英文摘要:

We give sufficient conditions for a measured length space (X,d,m) to admit local and global Poincare inequalities. We first introduce a condition DM on (X,d,m), defined in terms of transport of measures. We show that DM, along with a doubling condition on m, implies a scale-invariant local Poincare inequality. We show that if (X,d,m) has nonnegative N-Ricci curvature and has unique minimizing geodesics between almost all pairs of points then it satisfies DM, with constant 2^N. The condition DM is preserved by measured Gromov-Hausdorff limits. We then prove a Sobolev inequality for measured length spaces with N-Ricci curvature bounded below by K>0. Finally, we prove a sharp global inequality.

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