Tag: Manifolds

Lightlike Submanifolds of Semi-Riemannian Manifolds and Applications


Free Download Lightlike Submanifolds of Semi-Riemannian Manifolds and Applications By Krishan L. Duggal, Aurel Bejancu (auth.)
1996 | 303 Pages | ISBN: 904814678X | PDF | 15 MB
This book is about the light like (degenerate) geometry of submanifolds needed to fill a gap in the general theory of submanifolds. The growing importance of light like hypersurfaces in mathematical physics, in particular their extensive use in relativity, and very limited information available on the general theory of lightlike submanifolds, motivated the present authors, in 1990, to do collaborative research on the subject matter of this book. Based on a series of author’s papers (Bejancu [3], Bejancu-Duggal [1,3], Dug gal [13], Duggal-Bejancu [1,2,3]) and several other researchers, this volume was conceived and developed during the Fall ’91 and Fall ’94 visits of Bejancu to the University of Windsor, Canada. The primary difference between the lightlike submanifold and that of its non degenerate counterpart arises due to the fact that in the first case, the normal vector bundle intersects with the tangent bundle of the submanifold. Thus, one fails to use, in the usual way, the theory of non-degenerate submanifolds (cf. Chen [1]) to define the induced geometric objects (such as linear connection, second fundamental form, Gauss and Weingarten equations) on the light like submanifold. Some work is known on null hypersurfaces and degenerate submanifolds (see an up-to-date list of references on pages 138 and 140 respectively). Our approach, in this book, has the following outstanding features: (a) It is the first-ever attempt of an up-to-date information on null curves, lightlike hypersur faces and submanifolds, consistent with the theory of non-degenerate submanifolds.

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Principal Symbol Calculus on Contact Manifolds


Free Download Principal Symbol Calculus on Contact Manifolds
English | 2024 | ISBN: 3031699254 | 170 Pages | PDF EPUB (True) | 16 MB
This book develops a C*-algebraic approach to the notion of principal symbol on Heisenberg groups and, using the fact that contact manifolds are locally modeled by Heisenberg groups, on compact contact manifolds. Applying abstract theorems due to Lord, Sukochev, Zanin and McDonald, a principal symbol on the Heisenberg group is introduced as a homomorphism of C*-algebras. This leads to a version of Connes’ trace theorem for Heisenberg groups, followed by a proof of the equivariant behavior of the principal symbol under Heisenberg diffeomorphisms. Using this equivariance and the authors’ globalization theorem, techniques are developed which enable further extensions to arbitrary stratified Lie groups and, as a consequence, the notion of a principal symbol on compact contact manifolds is described via a patching process. Finally, the Connes trace formula on compact contact sub-Riemannian manifolds is established and a spectrally correct version of the sub-Riemannian volume is defined (different from Popp’s measure).

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Infinite Dimensional Kähler Manifolds


Free Download Alan Huckleberry, Tilmann Wurzbacher, "Infinite Dimensional Kähler Manifolds"
English | 2001 | pages: 388 | ISBN: 3764366028 | DJVU | 3,0 mb
Infinite dimensional manifolds, Lie groups and algebras arise naturally in many areas of mathematics and physics. Having been used mainly as a tool for the study of finite dimensional objects, the emphasis has changed and they are now frequently studied for their own independent interest. On the one hand this is a collection of closely related articles on infinite dimensional Kähler manifolds and associated group actions which grew out of a DMV-Seminar on the same subject. On the other hand it covers significantly more ground than was possible during the seminar in Oberwolfach and is in a certain sense intended as a systematic approach which ranges from the foundations of the subject to recent developments. It should be accessible to doctoral students and as well researchers coming from a wide range of areas. The initial chapters are devoted to a rather selfcontained introduction to group actions on complex and symplectic manifolds and to Borel-Weil theory in finite dimensions. These are followed by a treatment of the basics of infinite dimensional Lie groups, their actions and their representations. Finally, a number of more specialized and advanced topics are discussed, e.g., Borel-Weil theory for loop groups, aspects of the Virasoro algebra, (gauge) group actions and determinant bundles, and second quantization and the geometry of the infinite dimensional Grassmann manifold.

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Geometric Analysis on Real Analytic Manifolds (Lecture Notes in Mathematics)


Free Download Geometric Analysis on Real Analytic Manifolds (Lecture Notes in Mathematics) by Andrew D. Lewis
English | November 8, 2023 | ISBN: 3031379128 | 332 pages | MOBI | 62 Mb
This monograph provides some useful tools for performing global geometric analysis on real analytic manifolds. At the core of the methodology of the book is a variety of descriptions for the topologies for the space of real analytic sections of a real analytic vector bundle and for the space of real analytic mappings between real analytic manifolds. Among the various descriptions for these topologies is a development of geometric seminorms for the space of real analytic sections. To illustrate the techniques in the book, a number of fundamental constructions in differential geometry are shown to induce continuous mappings on spaces of real analytic sections and mappings.

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Fat Manifolds and Linear Connections


Free Download Fat Manifolds and Linear Connections By Alessandro De Paris, Alexandre M
2008 | 312 Pages | ISBN: 9812819045 | PDF | 4 MB
The theory of connections is central not only in pure mathematics (differential and algebraic geometry), but also in mathematical and theoretical physics (general relativity, gauge fields, mechanics of continuum media). The now-standard approach to this subject was proposed by Ch. Ehresmann 60 years ago, attracting first mathematicians and later physicists by its transparent geometrical simplicity. Unfortunately, it does not extend well to a number of recently emerged situations of significant importance (singularities, supermanifolds, infinite jets and secondary calculus, etc.). Moreover, it does not help in understanding the structure of calculus naturally related with a connection. In this unique book, written in a reasonably self-contained manner, the theory of linear connections is systematically presented as a natural part of differential calculus over commutative algebras. This not only makes easy and natural numerous generalizations of the classical theory and reveals various new aspects of it, but also shows in a clear and transparent manner the intrinsic structure of the associated differential calculus. The notion of a "fat manifold" introduced here then allows the reader to build a well-working analogy of this "connection calculus" with the usual one. Contents: Elements of Differential Calculus over Commutative Algebras:; Algebraic Tools; Smooth Manifolds; Vector Bundles; Vector Fields; Differential Forms; Lie Derivative; Basic Differential Calculus on Fat Manifolds:; Basic Definitions; The Lie Algebra of Der-operators; Fat Vector Fields; Fat Fields and Vector Fields on the Total Space; Induced Der-operators; Fat Trajectories; Inner Structures; Linear Connections:; Basic Definitions and Examples; Parallel Translation; Curvature; Operations with Linear Connections; Linear Connections and Inner Structures; Covariant Differential:; Fat de Rham Complexes; Covariant Differential; Compatible Linear Connections; Linear Connections Along Fat Maps; Covariant Lie Derivative; Gauge/Fat Structures and Linear Connections; Cohomological Aspects of Linear Connections:; An Introductory Example; Cohomology of Flat Linear Connections; Maxwell’s Equations; Homotopy Formula for Linear Connections; Characteristic Classes.

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An Introduction to Manifolds


Free Download Loring W. Tu, "An Introduction to Manifolds"
English | 2010 | pages: 427 | ISBN: 1441973990 | PDF | 4,0 mb
Manifolds, the higher-dimensional analogs of smooth curves and surfaces, are fundamental objects in modern mathematics. Combining aspects of algebra, topology, and analysis, manifolds have also been applied to classical mechanics, general relativity, and quantum field theory. In this streamlined introduction to the subject, the theory of manifolds is presented with the aim of helping the reader achieve a rapid mastery of the essential topics. By the end of the book the reader should be able to compute, at least for simple spaces, one of the most basic topological invariants of a manifold, its de Rham cohomology. Along the way, the reader acquires the knowledge and skills necessary for further study of geometry and topology. The requisite point-set topology is included in an appendix of twenty pages; other appendices review facts from real analysis and linear algebra. Hints and solutions are provided to many of the exercises and problems. This work may be used as the text for a one-semester graduate or advanced undergraduate course, as well as by students engaged in self-study. Requiring only minimal undergraduate prerequisites, ‘Introduction to Manifolds’ is also an excellent foundation for Springer’s GTM 82, ‘Differential Forms in Algebraic Topology’.

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Manifolds of Nonpositive Curvature


Free Download Manifolds of Nonpositive Curvature by Werner Ballmann , Mikhael Gromov , Viktor Schroeder
English | PDF | 1985 | 280 Pages | ISBN : 146849161X | 13.5 MB
This volume presents a complete and self-contained description of new results in the theory of manifolds of nonpositive curvature. It is based on lectures delivered by M. Gromov at the Collège de France in Paris. Among others these lectures threat local and global rigidity problems (e.g., a generalization of the famous Mostow rigidity theorem) and finiteness results for manifolds of finite volume. V. Schroeder wrote up these lectures, including complete and detailed proofs. A lot of background material is added to the first lectures. Therefore this book may also serve as an introduction to the subject of nonpositively curved manifolds. The latest progress in this area is reflected in the article of W. Ballmann describing the structure of manifolds of higher rank.

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Calabi-Yau Manifolds and Related Geometries


Free Download Calabi-Yau Manifolds and Related Geometries: Lectures at a Summer School in Nordfjordeid, Norway, June 2001 by Mark Gross , Dominic Joyce , Daniel Huybrechts
English | PDF (True) | 2003 | 245 Pages | ISBN : 3540440593 | 22 MB
Each summer since 1996,algebraic geometers and algebraists in Norway have organised a summer school in Nordfjordeid, a small place in the western part of Norway. In addition to the beauty of the place, located between the mountains, close to the fjord and not far from the Norway’s largest glacier, a reason for going there is that Sophus Lie was born and spent his few first years in Nordfjordeid, so it has a flavour of both the exotic and pilgrimage. It is also convenient: the municipality of Eid has created a conference centre named after Sophus Lie, aimed at attracting activities to fillthe summer term of the local boarding school.

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Embeddings in manifolds


Free Download Embeddings in manifolds By Robert J. Daverman and Gerard A. Venema
2009 | 496 Pages | ISBN: 0821836978 | PDF | 9 MB
A topological embedding is a homeomorphism of one space onto a subspace of another. The book analyzes how and when objects like polyhedra or manifolds embed in a given higher-dimensional manifold. The main problem is to determine when two topological embeddings of the same object are equivalent in the sense of differing only by a homeomorphism of the ambient manifold. Knot theory is the special case of spheres smoothly embedded in spheres; in this book, much more general spaces and much more general embeddings are considered. A key aspect of the main problem is taming: when is a topological embedding of a polyhedron equivalent to a piecewise linear embedding? A central theme of the book is the fundamental role played by local homotopy properties of the complement in answering this taming question. The book begins with a fresh description of the various classic examples of wild embeddings (i.e., embeddings inequivalent to piecewise linear embeddings). Engulfing, the fundamental tool of the subject, is developed next. After that, the study of embeddings is organized by codimension (the difference between the ambient dimension and the dimension of the embedded space). In all codimensions greater than two, topological embeddings of compacta are approximated by nicer embeddings, nice embeddings of polyhedra are tamed, topological embeddings of polyhedra are approximated by piecewise linear embeddings, and piecewise linear embeddings are locally unknotted. Complete details of the codimension-three proofs, including the requisite piecewise linear tools, are provided. The treatment of codimension-two embeddings includes a self-contained, elementary exposition of the algebraic invariants needed to construct counterexamples to the approximation and existence of embeddings. The treatment of codimension-one embeddings includes the locally flat approximation theorem for manifolds as well as the characterization of local flatness in terms of local homotopy properties

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Automorphisms of manifolds and algebraic K-theory Part III


Free Download Automorphisms of manifolds and algebraic K-theory: Part III By Michael S. Weiss, Bruce E. Williams
2014 | 122 Pages | ISBN: 147040981X | PDF | 1 MB
The structure space $\mathcal{S}(M)$ of a closed topological $m$-manifold $M$ classifies bundles whose fibers are closed $m$-manifolds equipped with a homotopy equivalence to $M$. The authors construct a highly connected map from $\mathcal{S}(M)$ to a concoction of algebraic $L$-theory and algebraic $K$-theory spaces associated with $M$. The construction refines the well-known surgery theoretic analysis of the block structure space of $M$ in terms of $L$-theory

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