Elliptic Quantum Groups

1. Front Matter

   Pages i-xiii

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2. Introduction

   • Hitoshi Konno

   Pages 1-18

3. Elliptic Quantum Group \(U_{q,p}({ \mathfrak {sl}}_2)\)

   • Hitoshi Konno

   Pages 19-35

4. The H-Hopf-Algebroid Structure of \(U_{q,p}({ \mathfrak {sl}}_2)_k\)

   • Hitoshi Konno

   Pages 37-42

5. Representations of \(U_{q,p}({ \mathfrak {sl}}_2)\)

   • Hitoshi Konno

   Pages 43-48

6. The Vertex Operators

   • Hitoshi Konno

   Pages 49-60

7. Elliptic Weight Functions

   • Hitoshi Konno

   Pages 61-74

8. Tensor Product Representation

   • Hitoshi Konno

   Pages 75-82

9. Elliptic q-KZ Equation

   • Hitoshi Konno

   Pages 83-86

10. Related Geometry

    • Hitoshi Konno

    Pages 87-102

11. Back Matter

    Pages 103-131

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This is the first book on elliptic quantum groups, i.e., quantum groups associated to elliptic solutions of the Yang-Baxter equation. Based on research by the author and his collaborators, the book presents a comprehensive survey on the subject including a brief history of formulations and applications, a detailed formulation of the elliptic quantum group in the Drinfeld realization,  explicit  construction of both finite and infinite-dimensional representations, and  a construction of the vertex operators as intertwining operators of these representations. The vertex operators are important objects in representation theory of quantum groups.  In this book, they are used to derive the elliptic q-KZ equations and their elliptic hypergeometric integral solutions. In particular, the so-called elliptic weight functions appear in such solutions.  The author’s recent study showed that these elliptic weight functions are identified with Okounkov’s elliptic stableenvelopes for certain equivariant elliptic cohomology and play an important role to construct geometric representations of elliptic quantum groups. Okounkov’s  geometric approach to quantum integrable systems is a rapidly growing topic in mathematical physics related to the Bethe ansatz, the Alday-Gaiotto-Tachikawa correspondence between 4D SUSY gauge theories and the CFT’s, and  the Nekrasov-Shatashvili  correspondences between quantum integrable systems and quantum cohomology. To invite the reader to such topics is one of the aims of this book.

• Elliptic quantum groups
• Vertex operators
• q-KZ equations
• Elliptic stable envelopes
• Quantum integrable systems

“The discussions in this book are brief and technical, so it will probably be of most interest to readers who are already familiar with other types of quantum groups but would like to get some idea of what is new or different in elliptic quantum groups.” (Robert Harold McRae, Mathematical Reviews, April, 2022)

“The presentation is as well very recommendable as a brief introduction to the subject.” (Sonia Natale, zbMATH 1467.17001, 2021)

• Department of Mathematics, Tokyo University of Marine Science and Technology, Tokyo, Japan

  Hitoshi Konno

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