Conformal Maps Of A Riemannian Surface Into The Space Of Quaternions
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Conformal Maps Of A Riemannian Surface Into The Space Of Quaternions
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Author : Dr. Jörg Richter
language : en
Publisher:
Release Date : 1997-09-01
Conformal Maps Of A Riemannian Surface Into The Space Of Quaternions written by Dr. Jörg Richter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-09-01 with Mathematics categories.
In the present work, a coordinate-free way is suggested to handle conformal maps of a Riemannian surface into a space of constant curvature of maximum dimension 4, modeled on the non-commutative field of quaternions. This setup for the target space and the idea to treat differential 2-forms on Riemannian surfaces as quadratic functions on the tangent space, are the starting points for the development of the theory of conformal maps and in particular of conformal immersions. As a first result, very nice conditions for the conformality of immersions into 3- and 4-dimensional space-forms are deduced and a simple way to write the second fundamental form is found. If the target space is euclidean 3-space, an alternative approach is proposed by fixing a spin structure on the Riemannian surface. The problem of finding a local immersion is then reduced to that of solving a linear Dirac equation with a potential whose square is the Willmore integrand. This allows to make statements about the structure of the moduli space of conformal immersions and to derive a very nice criterion for a conformal immersion to be constrained Willmore. As an application the Dirac equation with constant potential over spheres and tori is solved. This yields explicit immersion formulae out of which there were produced pictures, the Dirac-spheres and -tori. These immersions have the property that their Willmore integrand generates a metric of vanishing and constant curvature, respectively. As a next step an affine immersion theory is developped. This means, one starts with a given conformal immersion into euclidean 3-space and looks for new ones in the same conformal class. This is called a spin-transformation and it leads one to solve an affine Dirac equation. Also, it is shown how the coordinate-dependent generalized Weierstrass representation fits into the present framework. In particular, it is now natural to consider the class of conformal immersions that admit new conformal immersions having the same potential. It turns out, that all geometrically interesting immersions admit such an isopotential spin-transformation and that this property of an immersion is even a conformal invariant of the ambient space. It is shown that conformal isothermal immersions generate both via their dual and via Darboux transformations non-trivial families of new isopotential conformal immersions. Similarly to this, conformal (constrained) Willmore immersions produce non-trivial families of isopotential immersions of which subfamilies are (constrained) Willmore again having even the same Willmore integral. Another observation is, that the Euler-Lagrange equation for the Willmore problem is the integrability condition for a quaternionic 1-form, which generates a conformal minimal immersions into hyperbolic 4-space. Vice versa, any such immersion determines a conformal Willmore immersion. As a consequence, there is a one-to-one correspondence between conformal minimal immersions into Lorentzian space and those into hyperbolic space, which generalizes to any dimension. There is also induced an action on conformal minimal immersions into hyperbolic 4-space. Another fact is, that conformal constant mean curvature (cmc) immersions into some 3-dimensional space form unveil to be isothermal and constrained Willmore. The reverse statement is true at least for tori. Finally a very simple proof of a theorem by R.Bryant concerning Willmore spheres is given. In the last part, time-dependent conformal immersions are considered. Their deformation formulae are computed and it is investigated under what conditions the flow commutes with Moebius transformations. The modified Novikov-Veselov flow is written down in a conformal invariant way and explicit deformation formulae for the immersion function itself and all of its invariants are given. This flow commutes with Moebius transformations. Its definition is coupled with a delta-bar problem, for which a solution is presented under special conditions. These are fulfilled at least by cmc immersions and by surfaces of revolution and the general flow formulae reduce to very nice formulae in these cases.
Conformal Geometry Of Surfaces In S4 And Quaternions
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Author : Francis E. Burstall
language : en
Publisher: Springer
Release Date : 2004-10-19
Conformal Geometry Of Surfaces In S4 And Quaternions written by Francis E. Burstall and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-10-19 with Mathematics categories.
The conformal geometry of surfaces recently developed by the authors leads to a unified understanding of algebraic curve theory and the geometry of surfaces on the basis of a quaternionic-valued function theory. The book offers an elementary introduction to the subject but takes the reader to rather advanced topics. Willmore surfaces in the foursphere, their Bäcklund and Darboux transforms are covered, and a new proof of the classification of Willmore spheres is given.
Constrained Willmore Surfaces
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Author : Áurea Casinhas Quintino
language : en
Publisher: Cambridge University Press
Release Date : 2021-06-10
Constrained Willmore Surfaces written by Áurea Casinhas Quintino and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-10 with Mathematics categories.
From Bäcklund to Darboux: a comprehensive journey through the transformation theory of constrained Willmore surfaces, with applications to constant mean curvature surfaces.
Geometry And Topology Of Submanifolds Ix
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Author : Leopold Verstraelen
language : en
Publisher: World Scientific
Release Date : 1999-07-22
Geometry And Topology Of Submanifolds Ix written by Leopold Verstraelen and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-07-22 with Mathematics categories.
Contents:Affine Bibliography 1998 (T Binder et al.)Contact Metric R-Harmonic Manifolds (K Arslan & C Murathan)Local Classification of Centroaffine Tchebychev Surfaces with Constant Curvature Metric (T Binder)Hypersurfaces in Space Forms with Some Constant Curvature Functions (F Brito et al.)Some Relations Between a Submanifold and Its Focal Set (S Carter & A West)On Manifolds of Pseudosymmetric Type (F Defever et al.)Hypersurfaces with Pseudosymmetric Weyl Tensor in Conformally Flat Manifolds (R Deszcz et al.)Least-Squares Geometrical Fitting and Minimising Functions on Submanifolds (F Dillen et al.)Cubic Forms Generated by Functions on Projectively Flat Spaces (J Leder)Distinguished Submanifolds of a Sasakian Manifold (I Mihai)On the Curvature of Left Invariant Locally Conformally Para-Kählerian Metrics (Z Olszak)Remarks on Affine Variations on the Ellipsoid (M Wiehe)Dirac's Equation, Schrödinger's Equation and the Geometry of Surfaces (T J Willmore)and other papers Readership: Researchers doing differential geometry and topology. Keywords:Proceedings;Geometry;Topology;Valenciennes (France);Lyon (France);Leuven (Belgium);Dedication
From Geometry To Quantum Mechanics
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Author : Yoshiaki Maeda
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-04-22
From Geometry To Quantum Mechanics written by Yoshiaki Maeda and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-04-22 with Mathematics categories.
* Invited articles in differential geometry and mathematical physics in honor of Hideki Omori * Focus on recent trends and future directions in symplectic and Poisson geometry, global analysis, Lie group theory, quantizations and noncommutative geometry, as well as applications of PDEs and variational methods to geometry * Will appeal to graduate students in mathematics and quantum mechanics; also a reference
Willmore Energy And Willmore Conjecture
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Author : Magdalena D. Toda
language : en
Publisher: CRC Press
Release Date : 2017-10-30
Willmore Energy And Willmore Conjecture written by Magdalena D. Toda and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-30 with Mathematics categories.
This book is the first monograph dedicated entirely to Willmore energy and Willmore surfaces as contemporary topics in differential geometry. While it focuses on Willmore energy and related conjectures, it also sits at the intersection between integrable systems, harmonic maps, Lie groups, calculus of variations, geometric analysis and applied differential geometry. Rather than reproducing published results, it presents new directions, developments and open problems. It addresses questions like: What is new in Willmore theory? Are there any new Willmore conjectures and open problems? What are the contemporary applications of Willmore surfaces? As well as mathematicians and physicists, this book is a useful tool for postdoctoral researchers and advanced graduate students working in this area.
Introduction To M Bius Differential Geometry
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Author : Udo Hertrich-Jeromin
language : en
Publisher: Cambridge University Press
Release Date : 2003-08-14
Introduction To M Bius Differential Geometry written by Udo Hertrich-Jeromin and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-08-14 with Mathematics categories.
This book introduces the reader to the geometry of surfaces and submanifolds in the conformal n-sphere.
Differential Geometry And Integrable Systems
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Author : Martin A. Guest
language : en
Publisher: American Mathematical Soc.
Release Date : 2002
Differential Geometry And Integrable Systems written by Martin A. Guest and has been published by American Mathematical Soc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Mathematics categories.
Ideas and techniques from the theory of integrable systems are playing an increasingly important role in geometry. Thanks to the development of tools from Lie theory, algebraic geometry, symplectic geometry, and topology, classical problems are investigated more systematically. New problems are also arising in mathematical physics. A major international conference was held at the University of Tokyo in July 2000. It brought together scientists in all of the areas influenced byintegrable systems. This book is the first of three collections of expository and research articles. This volume focuses on differential geometry. It is remarkable that many classical objects in surface theory and submanifold theory are described as integrable systems. Having such a description generallyreveals previously unnoticed symmetries and can lead to surprisingly explicit solutions. Surfaces of constant curvature in Euclidean space, harmonic maps from surfaces to symmetric spaces, and analogous structures on higher-dimensional manifolds are some of the examples that have broadened the horizons of differential geometry, bringing a rich supply of concrete examples into the theory of integrable systems. Many of the articles in this volume are written by prominent researchers and willserve as introductions to the topics. It is intended for graduate students and researchers interested in integrable systems and their relations to differential geometry, topology, algebraic geometry, and physics. The second volume from this conference also available from the AMS is Integrable Systems,Topology, and Physics, Volume 309 CONM/309in the Contemporary Mathematics series. The forthcoming third volume will be published by the Mathematical Society of Japan and will be available outside of Japan from the AMS in the Advanced Studies in Pure Mathematics series.
Conformal Maps Of A Riemannian Surface Into The Space Of Quaternions
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Author :
language : de
Publisher:
Release Date : 1997
Conformal Maps Of A Riemannian Surface Into The Space Of Quaternions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Quaternions Spinors And Surfaces
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Author : George Kamberov
language : en
Publisher: American Mathematical Soc.
Release Date : 2002
Quaternions Spinors And Surfaces written by George Kamberov and has been published by American Mathematical Soc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Mathematics categories.
Many classical problems in pure and applied mathematics remain unsolved or partially solved. This book studies some of these questions by presenting new and important results that should motivate future research. Strong bookstore candidate.