Geometry of Harmonic Maps
(Sprache: Englisch)
Harmonic maps are solutions to a natural geometrical variational prob lem. This notion grew out of essential notions in differential geometry, such as geodesics, minimal surfaces and harmonic functions. Harmonic maps are also closely related to holomorphic...
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Klappentext zu „Geometry of Harmonic Maps “
Harmonic maps are solutions to a natural geometrical variational prob lem. This notion grew out of essential notions in differential geometry, such as geodesics, minimal surfaces and harmonic functions. Harmonic maps are also closely related to holomorphic maps in several complex variables, to the theory of stochastic processes, to nonlinear field theory in theoretical physics, and to the theory of liquid crystals in materials science. During the past thirty years this subject has been developed extensively. The monograph is by no means intended to give a complete description of the theory of harmonic maps. For example, the book excludes a large part of the theory of harmonic maps from 2-dimensional domains, where the methods are quite different from those discussed here. The first chapter consists of introductory material. Several equivalent definitions of harmonic maps are described, and interesting examples are presented. Various important properties and formulas are derived. Among them are Bochner-type formula for the energy density and the second varia tional formula. This chapter serves not only as a basis for the later chapters, but also as a brief introduction to the theory. Chapter 2 is devoted to the conservation law of harmonic maps. Em phasis is placed on applications of conservation law to the mono tonicity formula and Liouville-type theorems.
Inhaltsverzeichnis zu „Geometry of Harmonic Maps “
I. Introduction.- 1.1 Vector Bundles.- 1.1.1 Vector Bundles.- 1.1.2 Connections.- 1.2 Harmonic Maps.- 1.2.1 Energy.- 1.2.2 Tension Field.- 1.2.3 The First Variational Formula.- 1.2.4 Examples of Harmonic Maps.- 1.3 A Bochner Type Formula.- 1.3.1 Hodge-Laplace Operator and Weitzenböck Formula.- 1.3.2 A Bochner Type Formula and Its Applications.- 1.4 Basic Properties of Harmonic Maps.- 1.4.1 Maximum Principle.- 1.4.2 Unique Continuation Theorems.- 1.4.3 Second Variational Formula and Stable Harmonic Maps.- II. Conservation Law.- 2.1 Stress-Energy Tensor and Conservation Law.- 2.2 Monotonicity Formula.- 2.3 Applications of Conservation Law to Liouville type Theorems.- 2.4 Further Generalizations.- III. Harmonic Maps and Gauss Maps.- 3.1 Generalized Gauss Maps.- 3.2 Cone-like Harmonic Maps.- 3.3 Generalized Maximum Principle.- 3.4 Estimates of Image Diameter and its Applications.- 3.5 Gauss Image of a Space-Like Hypersurface in Minkowski Space.- 3.6 Gauss Image of a Space-Like Submanifold in Pseudo-Euclidean Space.- 3.6.1 Geometry of ?IV(2).- 3.6.2 Gauss Map.- 3.6.3 Gauss Image of a Space-like Surface in R24.- IV. Harmonic Maps and Holomorphic Maps.- 4.1 Partial Energies.- 4.2 Harmonicity of Holomorphic Maps.- 4.3 Holomorphicity of Harmonic Maps.- V. Existence, Nonexistence and Regularity.- 5.1 Direct Method of the Calculus of Variations.- 5.2 Regularity Theorems.- 5.3 Nonexistence and Existence.- 5.4 Regularity Results of Harmonic Maps into Positively Curved Manifolds.- VI. Equivariant Harmonic Maps.- 6.1 Riemannian Submersions and Equivariant Harmonic Maps.- 6.2 Reduction Theorems.- 6.3 Equivariant Variational Formulas.- 6.4 On Harmonic Representatives of ?m(Sm).- 6.4.1 ODE of Smith's Construction.- 6.4.2 The Solvability of ODE (6.31) and (6.33).- 6.4.3 Application of Smith's Construction.- 6.4.4 Another Construction of Equivariant Maps.- 6.4.5 The Solvability of ODE (6.63) and (6.65).- 6.4.6 On Harmonic Representatives of Homotopy Group of the Higher Dimensional
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Sphere.- 6.5 Harmonic Maps via Isoparametric Maps.- 6.6 Harmonic Maps of Projective Spaces.- 6.6.1 Harmonic Maps from QPn - 1 into Sml.- 6.6.2 Harmonic Maps from QPn - 1 into QPm-1.- 6.7 Equivariant Boundary Value Problems.- 6.7.1 The Reduced PDE.- 6.7.2 The Solvability of PDE.- 6.7.3 Construction of Equivariant Maps into CP2.- 6.7.4 Heat Flow.- 6.7.5 Global Existence and Subconvergence.- References.
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Bibliographische Angaben
- Autor: Yuanlong Xin
- 1996, 260 Seiten, Maße: 16 x 24,1 cm, Gebunden, Englisch
- Verlag: Birkhäuser Boston
- ISBN-10: 0817638202
- ISBN-13: 9780817638207
- Erscheinungsdatum: 30.04.1996
Sprache:
Englisch
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