Orbifolds and Stringy Topology

Alejandro Adem; Johann Leida; Yongbin Ruan

doi:10.1017/CBO9780511543081

An introduction to the theory of orbifolds from a modern perspective, combining techniques from geometry, algebraic topology and algebraic geometry. One of the main motivations, and a major source of examples, is string theory, where orbifolds play an important role. The subject is first developed following the classical description analogous to manifold theory, after which the book branches out to include the useful description of orbifolds provided by groupoids, as well as many examples in the context of algebraic geometry. Classical invariants such as de Rham cohomology and bundle theory are developed, a careful study of orbifold morphisms is provided, and the topic of orbifold K-theory is covered. The heart of this book, however, is a detailed description of the Chen-Ruan cohomology, which introduces a product for orbifolds and has had significant impact. The final chapter includes explicit computations for a number of interesting examples.

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Orbifolds and Stringy Topology

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Contents

Frontmatter
pp i-iv

Contents
pp v-vi

Introduction
pp vii-xii

1 - Foundations
pp 1-31

2 - Cohomology, bundles and morphisms
pp 32-55

3 - Orbifold K-theory
pp 56-77

4 - Chen–Ruan cohomology
pp 78-104

5 - Calculating Chen–Ruan cohomology
pp 105-137

References
pp 138-145

Index
pp 146-149

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