Splitting Deformations of Degenerations of Complex Curves

Splitting Deformations of Degenerations of Complex Curves PDF

Author: Shigeru Takamura

Publisher: Springer Science & Business Media

Published: 2006-07-26

Total Pages: 584

ISBN-13: 3540333630

DOWNLOAD EBOOK →

The author develops a deformation theory for degenerations of complex curves; specifically, he treats deformations which induce splittings of the singular fiber of a degeneration. He constructs a deformation of the degeneration in such a way that a subdivisor is "barked" (peeled) off from the singular fiber. These "barking deformations" are related to deformations of surface singularities (in particular, cyclic quotient singularities) as well as the mapping class groups of Riemann surfaces (complex curves) via monodromies. Important applications, such as the classification of atomic degenerations, are also explained.

Splitting Deformations of Degenerations of Complex Curves

Splitting Deformations of Degenerations of Complex Curves PDF

Author: Shigeru Takamura

Publisher: Springer

Published: 2006-07-26

Total Pages: 594

ISBN-13: 9783540333630

DOWNLOAD EBOOK →

Here is a deformation theory for degenerations of complex curves; specifically, discussing deformations which induce splitting of the singular fiber of a degeneration. The author constructs a deformation of the degeneration in such a way that a subdivisor is "barked," or peeled off from the singular fiber. "Barking deformations" are related to deformations of surface singularities, in particular, cyclic quotient singularities, as well as the mapping class groups of Riemann surfaces via monodromies.

Towards the Classification of Atoms of Degenerations

Towards the Classification of Atoms of Degenerations PDF

Author: Shigeru Takamura

Publisher:

Published: 2001

Total Pages: 224

ISBN-13:

DOWNLOAD EBOOK →

Abstract: "This is the second part of our series of works which make a systematic study of degenerations of complex curves, and their splitting deformations. In the present volume we discuss the construction of degenerations. Namely, we (1) reconstruct Matsumoto-Montesinos theory from algebro-geometric viewpoint, and (2) establish the connection between (cyclic and dihedral) quotient singularities and monodromies, and (3) show that among any topologically equivalent class of degenerations, there exists a linear degeneration (linear approximation theorem of degenerations). As a consequence, we recover a fundamental theorem due to Matsumoto and Montesinos."

Geometry of General Curves Via Degenerations and Deformations

Geometry of General Curves Via Degenerations and Deformations PDF

Author: Jie Wang

Publisher:

Published: 2010

Total Pages: 72

ISBN-13:

DOWNLOAD EBOOK →

Abstract: This thesis studies the geometric and deformational behavior of linear series under degenerations with the aim of attacking the maximal rank conjecture. There are three parts. The first part gives an explicit construction of the classical tangent-obstruction theory for deformations of the pair $(X, L)$ to the case when $X$ is local complete intersection scheme and $L$ a line bundle on $X$. In the second part, we propose a new method, using deformation theory, to study the maximal rank conjecture. We prove that the maximal rank conjecture holds for the first unknown case: line bundles of extremal degree. Problems related to the maximal rank conjecture have become potentially accessible to this new method. In the third part, a canonical semi-stable degeneration of the $d$-th symmetric product $C^{(d)}$ as the curve $C$ becomes singular is constructed.

Towards the Classification of Atoms of Degenerations

Towards the Classification of Atoms of Degenerations PDF

Author: Shigeru Takamura

Publisher:

Published: 2001

Total Pages: 52

ISBN-13:

DOWNLOAD EBOOK →

Abstract: "Motivated by the classification problem of atomic degenerations, in our series of papers, we make a systematic study for splitting deformations of degenerations of complex curves. We provide various new methods to construct splitting deformations, and deduce many splitting criteria of degenerations, which will be applied to the classification of atomic degenerations. Roughly, our criteria are separated into two types; in the first type the criteria are expressed in terms of the configuration of a singular fiber, and in the second type, in terms of sub-divisors of a singular fiber. In both types, our constructions are 'visible', in that we can view how the singular fiber is deformed. In the present paper, we demonstrate splitting criteria of the first type."

Pseudo-periodic Maps and Degeneration of Riemann Surfaces

Pseudo-periodic Maps and Degeneration of Riemann Surfaces PDF

Author: Yukio Matsumoto

Publisher: Springer Science & Business Media

Published: 2011-08-17

Total Pages: 251

ISBN-13: 3642225330

DOWNLOAD EBOOK →

The first part of the book studies pseudo-periodic maps of a closed surface of genus greater than or equal to two. This class of homeomorphisms was originally introduced by J. Nielsen in 1944 as an extension of periodic maps. In this book, the conjugacy classes of the (chiral) pseudo-periodic mapping classes are completely classified, and Nielsen's incomplete classification is corrected. The second part applies the results of the first part to the topology of degeneration of Riemann surfaces. It is shown that the set of topological types of all the singular fibers appearing in one parameter holomorphic families of Riemann surfaces is in a bijective correspondence with the set of conjugacy classes of the pseudo-periodic maps of negative twists. The correspondence is given by the topological monodromy.

Handbook of Teichmüller Theory

Handbook of Teichmüller Theory PDF

Author: Athanase Papadopoulos

Publisher: European Mathematical Society

Published: 2007

Total Pages: 888

ISBN-13: 9783037190555

DOWNLOAD EBOOK →

This multi-volume set deals with Teichmuller theory in the broadest sense, namely, as the study of moduli space of geometric structures on surfaces, with methods inspired or adapted from those of classical Teichmuller theory. The aim is to give a complete panorama of this generalized Teichmuller theory and of its applications in various fields of mathematics. The volumes consist of chapters, each of which is dedicated to a specific topic. The volume has 19 chapters and is divided into four parts: The metric and the analytic theory (uniformization, Weil-Petersson geometry, holomorphic families of Riemann surfaces, infinite-dimensional Teichmuller spaces, cohomology of moduli space, and the intersection theory of moduli space). The group theory (quasi-homomorphisms of mapping class groups, measurable rigidity of mapping class groups, applications to Lefschetz fibrations, affine groups of flat surfaces, braid groups, and Artin groups). Representation spaces and geometric structures (trace coordinates, invariant theory, complex projective structures, circle packings, and moduli spaces of Lorentz manifolds homeomorphic to the product of a surface with the real line). The Grothendieck-Teichmuller theory (dessins d'enfants, Grothendieck's reconstruction principle, and the Teichmuller theory of the solenoid). This handbook is an essential reference for graduate students and researchers interested in Teichmuller theory and its ramifications, in particular for mathematicians working in topology, geometry, algebraic geometry, dynamical systems and complex analysis. The authors are leading experts in the field.

Methods of Contemporary Mathematical Statistical Physics

Methods of Contemporary Mathematical Statistical Physics PDF

Author: Marek Biskup

Publisher: Springer

Published: 2009-07-31

Total Pages: 350

ISBN-13: 3540927964

DOWNLOAD EBOOK →

This volume presents a collection of courses introducing the reader to the recent progress with attention being paid to laying solid grounds and developing various basic tools. It presents new results on phase transitions for gradient lattice models.