Symplectic Actions of $2$-Tori on $4$-Manifolds
Symplectic Actions of $2$-Tori on $4$-Manifolds

Author: Alvaro Pelayo

Publisher: American Mathematical Soc.

Published: 2010-02-22

Total Pages: 96

ISBN-13: 0821847139

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In this paper the author classifies symplectic actions of $2$-tori on compact connected symplectic $4$-manifolds, up to equivariant symplectomorphisms. This extends results of Atiyah, Guillemin-Sternberg, Delzant and Benoist. The classification is in terms of a collection of invariants of the topology of the manifold, of the torus action and of the symplectic form. The author constructs explicit models of such symplectic manifolds with torus actions, defined in terms of these invariants.

The Topology of Torus Actions on Symplectic Manifolds
The Topology of Torus Actions on Symplectic Manifolds

Author: Michèle Audin

Publisher: Birkhäuser

Published: 2012-12-06

Total Pages: 181

ISBN-13: 3034872216

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The material and references in this extended second edition of "The Topology of Torus Actions on Symplectic Manifolds", published as Volume 93 in this series in 1991, have been updated. Symplectic manifolds and torus actions are investigated, with numerous examples of torus actions, for instance on some moduli spaces. Although the book is still centered on convexity results, it contains much more material, in particular lots of new examples and exercises.

Torus Actions on Symplectic Manifolds
Torus Actions on Symplectic Manifolds

Author: Michèle Audin

Publisher: Birkhäuser

Published: 2012-12-06

Total Pages: 331

ISBN-13: 3034879601

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The material and references in this extended second edition of "The Topology of Torus Actions on Symplectic Manifolds", published as Volume 93 in this series in 1991, have been updated. Symplectic manifolds and torus actions are investigated, with numerous examples of torus actions, for instance on some moduli spaces. Although the book is still centered on convexity results, it contains much more material, in particular lots of new examples and exercises.

Lectures on Symplectic Geometry
Lectures on Symplectic Geometry

Author: Ana Cannas da Silva

Publisher: Springer

Published: 2004-10-27

Total Pages: 240

ISBN-13: 354045330X

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The goal of these notes is to provide a fast introduction to symplectic geometry for graduate students with some knowledge of differential geometry, de Rham theory and classical Lie groups. This text addresses symplectomorphisms, local forms, contact manifolds, compatible almost complex structures, Kaehler manifolds, hamiltonian mechanics, moment maps, symplectic reduction and symplectic toric manifolds. It contains guided problems, called homework, designed to complement the exposition or extend the reader's understanding. There are by now excellent references on symplectic geometry, a subset of which is in the bibliography of this book. However, the most efficient introduction to a subject is often a short elementary treatment, and these notes attempt to serve that purpose. This text provides a taste of areas of current research and will prepare the reader to explore recent papers and extensive books on symplectic geometry where the pace is much faster. For this reprint numerous corrections and clarifications have been made, and the layout has been improved.

$C^*$-Algebras of Homoclinic and Heteroclinic Structure in Expansive Dynamics
$C^*$-Algebras of Homoclinic and Heteroclinic Structure in Expansive Dynamics

Author: Klaus Thomsen

Publisher: American Mathematical Soc.

Published: 2010-06-11

Total Pages: 138

ISBN-13: 0821846922

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The author unifies various constructions of $C^*$-algebras from dynamical systems, specifically, the dimension group construction of Krieger for shift spaces, the corresponding constructions of Wagoner and Boyle, Fiebig and Fiebig for countable state Markov shifts and one-sided shift spaces, respectively, and the constructions of Ruelle and Putnam for Smale spaces. The general setup is used to analyze the structure of the $C^*$-algebras arising from the homoclinic and heteroclinic equivalence relations in expansive dynamical systems, in particular, expansive group endomorphisms and automorphisms and generalized 1-solenoids. For these dynamical systems it is shown that the $C^*$-algebras are inductive limits of homogeneous or sub-homogeneous algebras with one-dimensional spectra.

Small Modifications of Quadrature Domains
Small Modifications of Quadrature Domains

Author: Makoto Sakai

Publisher: American Mathematical Soc.

Published: 2010

Total Pages: 282

ISBN-13: 0821848100

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For a given plane domain, the author adds a constant multiple of the Dirac measure at a point in the domain and makes a new domain called a quadrature domain. The quadrature domain is characterized as a domain such that the integral of a harmonic and integrable function over the domain equals the integral of the function over the given domain plus the integral of the function with respect to the added measure. The family of quadrature domains can be modeled as the Hele-Shaw flow with a free-boundary problem. The given domain is regarded as the initial domain and the support point of the Dirac measure as the injection point of the flow.