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arXiv math/0606675math.DGmath.AP
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中曲率与等周不等式的非线性演化

Nonlinear evolution by mean curvature and isoperimetric inequalities

Felix Schulze

摘要:

在R^{n+1}中,以等于中曲率的正幂k的法向速度演化的光滑紧致超曲面,在k >= n-1的情况下,改进了一定的“等周差”。由于奇点可能发展之前的体积为零,我们开发了一个弱水平集制定这样的流量,并表明上述单调性仍然是有效的。这证明了n <= 7时的等周不等式。将其推广到具有非正截面曲率的完备单连通三维流形,给出了这类流形上欧氏等周不等式的一个新证明。

英文摘要:

Evolving smooth, compact hypersurfaces in R^{n+1} with normal speed equal to a positive power k of the mean curvature improves a certain 'isoperimetric difference' for k >= n-1. As singularities may develop before the volume goes to zero, we develop a weak level-set formulation for such flows and show that the above monotonicity is still valid. This proves the isoperimetric inequality for n <= 7. Extending this to complete, simply connected 3-dimensional manifolds with nonpositive sectional curvature, we give a new proof for the Euclidean isoperimetric inequality on such manifolds.

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