Geometric approach to evolution problems in metric spaces
Автор:Igor Stojkovic Год: 2011 Издание:LAP Lambert Academic Publishing Страниц: 240 ISBN: 9783845435633 This PhD thesis contains four chapters where research material on a range of different topics is presented. The used and developed techniques fall within the scope of analysis, probability and metric geometry, while a significant part of the manuscript contributes to the optimal transportation theory. In the second chapter the product formulas for semigroups induced by convex functionals in general CAT(0) spaces are proven---extending the classical results in Hilbert spaces. Third chapter contains a treatment of the non-symmetric Fokker-Planck equation as a flow on the Wasserstein-2 space of probability measures---we prove that its semigroup of solutions possesses similar properties to the properties of the gradient flow semigroups. In the forth chapter a general theory of maximal monotone operators and the induced flows on Wasserstein-2 spaces over Euclidean spaces is developed. This theory generalizes the theory of gradient flows by Ambrosio-Gigli-Savare. In the fifth chapter the...
