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arXiv 0706.4449math.DGmath.GRmath.GTmath.MG
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曲面的Cheeger常数与等周不等式

Cheeger constants of surfaces and isoperimetric inequalities

Panos Papasoglu

摘要:

我们证明了紧致曲面的Cheeger常数是有界的面积的函数。我们将此应用于有界亏格非紧曲面的等周轮廓,以表明如果它们的等周轮廓比$\sqrt t$增长得更快,则它至少与线性函数一样快。这推广了Gromov关于单连通曲面的一个结果。研究了三维空间中的等周问题。我们证明了如果填充体积函数在2维是欧几里德的,而在3维是亚欧几里德的,并且存在一个$g$使得极小在3维最多有亏格$g$,那么填充函数在3维是“几乎”线性的。

英文摘要:

We show that the Cheeger constant of compact surfaces is bounded by a function of the area. We apply this to isoperimetric profiles of bounded genus non-compact surfaces, to show that if their isoperimetric profile grows faster than $\sqrt t$, then it grows at least as fast as a linear function. This generalizes a result of Gromov for simply connected surfaces. We study the isoperimetric problem in dimension 3. We show that if the filling volume function in dimension 2 is Euclidean, while in dimension 3 is sub-Euclidean and there is a $g$ such that minimizers in dimension 3 have genus at most $g$, then the filling function in dimension 3 is `almost' linear.

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