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Logarithmic Potentials with External Fields, 2 Ed.
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Series: Grundlehren der mathematischen Wissenschaften, Vol.316 Author: Vilmos Totik; Edward B. Saff Publisher: Springer ISBN: 9783031651328 Cover: HARDCOVER Date: 2024年10月 DESCRIPTION This is the second edition of an influential monograph on logarithmic potentials with external fields, incorporating some of the numerous advancements made since the initial publication. As the title implies, the book expands the classical theory of logarithmic potentials to encompass scenarios involving an external field. This external field manifests as a weight function in problems dealing with energy minimization and its associated equilibria. These weighted energies arise in diverse applications such as the study of electrostatics problems, orthogonal polynomials, approximation by polynomials and rational functions, as well as tools for analyzing the asymptotic behavior of eigenvalues for random matrices, all of which are explored in the book. The theory delves into diverse properties of the extremal measure and its logarithmic potentials, paving the way for various numerical methods. This new, updated edition has been thoroughly revised and is reorganized into three parts, Fundamentals, Applications and Generalizations, followed by the Appendices. Additions to the new edition include: new material on the following topics: analytic and C2 weights, differential and integral formulae for equilibrium measures, constrained energy problems, vector equilibrium problems, and a probabilistic approach to balayage and harmonic measures; a new chapter entitled Classical Logarithmic Potential Theory, which conveniently summarizes the main results for logarithmic potentials without external fields; several new proofs and sharpened forms of some main theorems; expanded bibliographic and historical notes with dozens of additional references. Aimed at researchers and students studying extremal problems and their applications, particularly those arising from minimizing specific integrals in the presence of an external field, this book assumes a firm grasp of fundamental real and complex analysis. It meticulously develops classical logarithmic potential theory alongside the more comprehensive weighted theory. TABLE OF CONTENTS Part 1 Fundamentals I Weighted Potentials II Recovery of Measures, Green Functions and Balayage III Weighted Polynomials IV Determination of the Extremal Measure Part 2 Applications and Generalizations V Extremal Point Methods VI Weights on the Real Line VII Applications Concerning Orthogonal Polynomials VIII Signed Measures IX Some Problems from Physics X Generalizations Part 3 Appendices A.I Basic Tools A.II The Dirichlet Problem and Harmonic Measures A.III Weighted approximation in ?? A.IV Classical Logarithmic Potential Theory
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