Harmonic Maps and Minimal Immersions with Symmetries Methods of Ordinary Differential Equations Applied to Elliptic Variational Problems. (Annals of Mathematics Studies)

Eells, James & Andrea Ratto

ISBN 10: 0691033218 / ISBN 13: 9780691033211

Editore: Princeton University Press, 1993

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Light wear and soiling to covers, otherwise text clean and solid; no dust jacket; AM-130; 9.75 X 6.50 X 0.75 inches; 244 pages.

Codice articolo 213348

Dati bibliografici

• Titolo: Harmonic Maps and Minimal Immersions with Symmetries Methods of Ordinary Differential Equations Applied to Elliptic Variational Problems. (Annals of Mathematics Studies)
• Editore: Princeton University Press
• Data di pubblicazione: 1993
• Lingua: Inglese
• ISBN 10: 0691033218
• ISBN 13: 9780691033211
• Rilegatura: Hardcover
• Condizione: Very Good
• Condizione della sovraccoperta: No Dust Jacket As Issued

Descrizione articolo

Riassunto

The aim of this book is to study harmonic maps, minimal and parallel mean curvature immersions in the presence of symmetry. In several instances, the latter permits reduction of the original elliptic variational problem to the qualitative study of certain ordinary differential equations: the authors' primary objective is to provide representative examples to illustrate these reduction methods and their associated analysis with geometric and topological applications.

The material covered by the book displays a solid interplay involving geometry, analysis and topology: in particular, it includes a basic presentation of 1-cohomogeneous equivariant differential geometry and of the theory of harmonic maps between spheres.

Contenuti

	Introduction
Pt. I	Basic Variational and Geometrical Properties
Ch. I	Harmonic maps and minimal immersions
	Basic properties of harmonic maps	13
	Minimal immersions	20
Ch. II	Immersions of parallel mean curvature
	Parallel mean curvature	24
	Alexandrov's theorem	29
Ch. III	Surfaces of parallel mean curvature
	Theorems of Chern and Ruh-Vilms	34
	Theorems of Almgren-Calabi and Hopf	37
	On the Sinh-Gordon equation	40
	Wente's theorem	42
Ch. IV	Reduction techniques
	Riemannian submersions	48
	Harmonic morphisms and maps into a circle	51
	Isoparametric maps	54
	Reduction techniques	58
Pt. II	G-Invariant Minimal and Constant Mean Curvature Immersions
Ch. V	First examples of reductions
	G-equivariant harmonic maps	64
	Rotation hypersurfaces in spheres	74
	Constant mean curvature rotation hypersurfaces in R[superscript n]	81
Ch. VI	Minimal embeddings of hyperspheres in S[superscript 4]
	Derivation of the equation and main theorem	92
	Existence of solutions starting at the boundary	95
	Analysis of the O.D.E. and proof of the main theorem	102
Ch. VII	Constant mean curvature immersions of hyperspheres into R[superscript n]
	Statement of the main theorem	111
	Analytical lemmas	114
	Proof of the main theorem	120
Pt. III	Harmonic Maps Between Spheres
Ch. VIII	Polynomial maps
	Eigenmaps S[superscript m] [actual symbol not reproducible] S[superscript n]	129
	Orthogonal multiplications and related constructions	137
	Polynomial maps between spheres	143
Ch. IX	Existence of harmonic joins
	The reduction equation	151
	Properties of the reduced energy functional J	154
	Analysis of the O.D.E.	157
	The damping conditions	161
	Examples of harmonic maps	167
Ch. X	The harmonic Hopf construction
	The existence theorem	171
	Examples of harmonic Hopf constructions	179
	[pi][subscript 3](S[superscript 2] and harmonic morphisms	182
	Appendix 1 Second variations	188
	Appendix 2 Riemannian immersions S[superscript m] [actual symbol not reproducible] S[superscript n]	200
	Appendix 3 Minimal graphs and pendent drops	204
	Appendix 4 Further aspects of pendulum type equations	208
	References	213
	Index	224