Nonlinear Diffusion Equations and Curvature Conditions in Metric Measure Spaces(Memoirs of the American Mathematical Society)

度量空间中的非线性扩散方程和曲率条件

数学分析

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出版时间
2020年03月30日
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平装
ISBN
9781470439132
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页      码
121
语      种
英文
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The aim of this paper is to provide new characterizations of the curvature dimension condition in the context of metric measure spaces $(X,mathsf d,mathfrak m)$. On the geometric side, the authors’ new approach takes into account suitable weighted action functionals which provide the natural modulus of $K$-convexity when one investigates the convexity properties of $N$-dimensional entropies. On the side of diffusion semigroups and evolution variational inequalities, the authors’ new approach uses the nonlinear diffusion semigroup induced by the $N$-dimensional entropy, in place of the heat flow. Under suitable assumptions (most notably the quadraticity of Cheeger’s energy relative to the metric measure structure) both approaches are shown to be equivalent to the strong $mathrm {CD}^{*}(K,N)$ condition of Bacher-Sturm.
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