Classifying Spaces of Degenerating Polarized Hodge Structures

Kazuya Kato, Sampei Usui

• Publisher: Princeton University Press
• Year: 2008
• Print ISBN: 9780691138220, 9780691138213
• eBook ISBN: 9781400837113
• Topic: Mathematics
• Subtopic: Linear Algebra
• Index: Mathematics

In 1970, Phillip Griffiths envisioned that points at infinity could be added to the classifying space D of polarized Hodge structures. In this book, Kazuya Kato and Sampei Usui realize this dream by creating a logarithmic Hodge theory. They use the logarithmic structures begun by Fontaine-Illusie to revive nilpotent orbits as a logarithmic Hodge structure.


The book focuses on two principal topics. First, Kato and Usui construct the fine moduli space of polarized logarithmic Hodge structures with additional structures. Even for a Hermitian symmetric domain D, the present theory is a refinement of the toroidal compactifications by Mumford et al. For general D, fine moduli spaces may have slits caused by Griffiths transversality at the boundary and be no longer locally compact. Second, Kato and Usui construct eight enlargements of D and describe their relations by a fundamental diagram, where four of these enlargements live in the Hodge theoretic area and the other four live in the algebra-group theoretic area. These two areas are connected by a continuous map given by the SL(2)-orbit theorem of Cattani-Kaplan-Schmid. This diagram is used for the construction in the first topic.

Table of contents

• Cover
• Title
• Copyright
• Contents
• Introduction
• Chapter 0. Overview
• Chapter 1. Spaces of Nilpotent Orbits and Spaces of Nilpotent i-Orbits
• Chapter 2. Logarithmic Hodge Structures
• Chapter 3. Strong Topology and Logarithmic Manifolds
• Chapter 4. Main Results
• Chapter 5. Fundamental Diagram
• Chapter 6. The Map ψ : D^♯val → DSL(2)
• Chapter 7. Proof of Theorem A
• Chapter 8. Proof of Theorem B
• Chapter 9. ♭-Spaces
• Chapter 10. Local Structures of DSL(2) and Г\D^♭SL(2),≤1
• Chapter 11. Moduli of PLH with Coefficients
• Chapter 12. Examples and Problems
• Appendix
• References
• List of Symbols
• Index