Singularity theory for non-twist KAM tori / A. González-Enríquez, A. Haro, R. de la Llave.

Format:

Book

Author/Creator:

González-Enríquez, A. (Alejandra), 1967- author.

Haro, A. (Alex), 1969- author.

De la Llave, Rafael, 1957- author.

Series:

Memoirs of the American Mathematical Society ; Volume 227, Number 1067.

Memoirs of the American Mathematical Society, 1947-6221 ; Volume 227, Number 1067

Language:

English

Subjects (All):

Bifurcation theory.

Perturbation (Mathematics).

Ergodic theory.

Physical Description:

1 online resource (128 p.)

Edition:

1st ed.

Place of Publication:

Providence, Rhode Island : American Mathematical Society, 2013.

Language Note:

English

Summary:

In this monograph the authors introduce a new method to study bifurcations of KAM tori with fixed Diophantine frequency in parameter-dependent Hamiltonian systems. It is based on Singularity Theory of critical points of a real-valued function which the authors call the potential. The potential is constructed in such a way that: nondegenerate critical points of the potential correspond to twist invariant tori (i.e. with nondegenerate torsion) and degenerate critical points of the potential correspond to non-twist invariant tori. Hence, bifurcating points correspond to non-twist tori.

Contents:

""Contents""; ""Part 1 . Introduction and preliminaries""; ""Chapter 1. Introduction""; ""1.1. Towards a singularity theory for KAM tori""; ""1.2. Methodology (a brief description)""; ""1.3. Outline of this monograph""; ""Chapter 2. Preliminaries""; ""2.1. Elementary notations""; ""2.2. Geometric preliminaries""; ""2.3. Symplectic deformations and moment maps""; ""2.4. Analytic preliminaries""; ""2.5. Cohomology equations""; ""Part 2 . Geometrical properties of KAM invariant tori""; ""Chapter 3. Geometric properties of an invariant torus""; ""3.1. Automatic reducibility""

""3.2. Geometric definition of non-twist tori""""3.3. Intrinsic character of the reducibility and of the torsion""; ""Chapter 4. Geometric properties of fibered Lagrangian deformations""; ""4.1. The potential of a fibered Lagrangian deformation""; ""4.2. A parametric version of the potential""; ""Part 3 . KAM results""; ""Chapter 5. Nondegeneracy on a KAM procedure with fixed frequency""; ""5.1. Approximate reducibility of approximately invariant tori""; ""5.2. Dummy and modifying parameters""; ""Chapter 6. A KAM theorem for symplectic deformations""

""6.1. Functional equations and nondegeneracy condition""""6.2. Statement of the KAM theorem""; ""6.3. Proof of the KAM Theorem""; ""Chapter 7. A Transformed Tori Theorem""; ""7.1. Nondegeneracy condition""; ""7.2. Statement of the Transformed Tori Theorem""; ""7.3. Proof of the Transformed Tori Theorem""; ""Part 4 . Singularity theory for KAM tori""; ""Chapter 8. Bifurcation theory for KAM tori""; ""8.1. Classification of KAM invariant tori""; ""8.2. Local equivalence of Bifurcations diagrams""; ""Chapter 9. The close-to-integrable case""; ""9.1. The integrable case""

""9.2. Persistence of invariant tori in quasi-integrable systems""""9.3. Unfolding non-twist tori""; ""9.4. The Birkhoff potential and the potential of an invariant torus""; ""Appendices""; ""Appendix A. Hamiltonian vector fields""; ""A.1. Cohomology equations""; ""A.2. Automatic reducibility of invariant tori""; ""A.3. Families of Hamiltonians and moment maps""; ""A.4. Potential and moment of an invariant FLD""; ""A.5. Transformed Tori Theorem""; ""A.6. A KAM Theorem for families of Hamiltonians""; ""Appendix B. Elements of singularity theory""; ""Bibliography""

Notes:

"Volume 227, Number 1067 (third of 4 numbers)."

Includes bibliographical references.

Description based on print version record.

ISBN:

1-4704-1428-7