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arXiv 1111.4715math.DGmath.APmath.MG
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里奇曲率的新单调性公式及其应用

New monotonicity formulas for Ricci curvature and applications; I

Tobias Holck Colding

摘要:

证明了三个新的具有里奇曲率下界的流形的单调性公式,并证明了它们与切锥的收敛速率有关。事实上,我们证明了这三个单调量的导数是有界的,从下面的Gromov-Hausdorff距离最近的锥。该单调性公式与经典的Bishop-Gromov体积比较定理和Perelman著名的里奇流单调性公式有关。我们将解释所有这些之间的联系。此外,我们表明,这些新的单调性公式与我们证明的格林函数的一个新的尖锐梯度估计。这与Perelman的单调性与Li-Yau热核的锐梯度估计密切相关。在[CM 4]中,我们将使用这里证明的单调性公式来证明Einstein流形的某些切锥的唯一性,在[CM 3]中,我们将证明一些相关的单调性公式。最后,我们的单调性与舍恩-丘和威滕的正质量定理有明显的相似之处。

英文摘要:

We prove three new monotonicity formulas for manifolds with a lower Ricci curvature bound and show that they are connected to rate of convergence to tangent cones. In fact, we show that the derivative of each of these three monotone quantities is bounded from below in terms of the Gromov-Hausdorff distance to the nearest cone. The monotonicity formulas are related to the classical Bishop-Gromov volume comparison theorem and Perelman's celebrated monotonicity formula for the Ricci flow. We will explain the connection between all of these. Moreover, we show that these new monotonicity formulas are linked to a new sharp gradient estimate for the Green's function that we prove. This is parallel to that Perelman's monotonicity is closely related to the sharp gradient estimate for the heat kernel of Li-Yau. In [CM4] we will use the monotonicity formulas we prove here to show uniqueness of certain tangent cones of Einstein manifolds and in [CM3] we will prove a number of related monotonicity formulas. Finally, there are obvious parallels between our monotonicity and the positive mass theorem of Schoen-Yau and Witten.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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