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In this thesis, we study the regularity of optimal transport maps and its applications to the semi-geostrophic system. The first two chapters survey the known theory, in particular there is a self-contained proof of Brenier’ theorem on existence of optimal transport maps and of Caffarelli’s Theorem on Holder continuity of optimal maps. In the third and fourth chapter we start investigating Sobolev regularity of optimal transport maps, while in Chapter 5 we show how the above mentioned results allows to prove the existence of Eulerian solution to the semi-geostrophic equation. In Chapter 6 we prove partial regularity of optimal maps with respect to a generic cost functions (it is well known that in this case global regularity can not be expected). More precisely we show that if the target and source measure have smooth densities the optimal map is always smooth outside a closed set of measure zero.
Geometry, Differential -- Congresses. --- Metric spaces -- Congresses. --- Mathematics --- Civil & Environmental Engineering --- Engineering & Applied Sciences --- Physical Sciences & Mathematics --- Operations Research --- Calculus --- Transportation problems (Programming) --- Mathematical optimization. --- Optimization (Mathematics) --- Optimization techniques --- Optimization theory --- Systems optimization --- Transport problems (Programming) --- Mathematics. --- Calculus of variations. --- Calculus of Variations and Optimal Control; Optimization. --- Mathematical analysis --- Maxima and minima --- Operations research --- Simulation methods --- System analysis --- Linear programming --- Isoperimetrical problems --- Variations, Calculus of --- Monge-Ampere equations. --- Differential equations, Partial.
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The purpose of these lecture notes is to provide an introduction to the theory of complex Monge–Ampère operators (definition, regularity issues, geometric properties of solutions, approximation) on compact Kähler manifolds (with or without boundary). These operators are of central use in several fundamental problems of complex differential geometry (Kähler–Einstein equation, uniqueness of constant scalar curvature metrics), complex analysis and dynamics. The topics covered include, the Dirichlet problem (after Bedford–Taylor), Monge–Ampère foliations and laminated currents, polynomial hulls and Perron envelopes with no analytic structure, a self-contained presentation of Krylov regularity results, a modernized proof of the Calabi–Yau theorem (after Yau and Kolodziej), an introduction to infinite dimensional riemannian geometry, geometric structures on spaces of Kähler metrics (after Mabuchi, Semmes and Donaldson), generalizations of the regularity theory of Caffarelli–Kohn–Nirenberg–Spruck (after Guan, Chen and Blocki) and Bergman approximation of geodesics (after Phong–Sturm and Berndtsson). Each chapter can be read independently and is based on a series of lectures by R. Berman, Z. Blocki, S. Boucksom, F. Delarue, R. Dujardin, B. Kolev and A. Zeriahi, delivered to non-experts. The book is thus addressed to any mathematician with some interest in one of the following fields, complex differential geometry, complex analysis, complex dynamics, fully non-linear PDE's and stochastic analysis.
Monge-Ampáere equations --- Geodesics (Mathematics) --- Kèahlerian structures --- Mathematics --- Physical Sciences & Mathematics --- Geometry --- Mathematical Theory --- Calculus --- Monge-Ampère equations. --- Kählerian structures. --- Structures, Kählerian --- Equations, Monge-Ampère --- Mathematics. --- Algebraic geometry. --- Partial differential equations. --- Functions of complex variables. --- Differential geometry. --- Several Complex Variables and Analytic Spaces. --- Differential Geometry. --- Partial Differential Equations. --- Algebraic Geometry. --- Differential geometry --- Complex variables --- Elliptic functions --- Functions of real variables --- Partial differential equations --- Algebraic geometry --- Math --- Science --- Complex manifolds --- Geometry, Differential --- Hermitian structures --- Global analysis (Mathematics) --- Differential equations, Partial --- Differential equations, partial. --- Global differential geometry. --- Geometry, algebraic. --- Monge-Ampere equations. --- Kahlerian structures.
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