Jacobi modular forms: 30 ans après

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About this course: This is a master course given in Moscow at the Laboratory of Algebraic Geometry of the National Research University Higher School of Economics by Valery Gritsenko, a professor of University Lille 1, France. Jacobi forms are holomorphic functions in two complex variables. They are modular in one variable and abelian (or double periodic) in another variable. The theory of Jacobi modular forms became an independent research subject after the famous book of Martin Eichler and Don Zagier “Jacobi modular forms” (Progress in Mathematics, vol. 55, 1985) which was cited more than a thousand times in research papers. This is due to many applications of Jacobi forms in arithmeti…

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When you enroll for courses through Coursera you get to choose for a paid plan or for a free plan

  • Free plan: No certicification and/or audit only. You will have access to all course materials except graded items.
  • Paid plan: Commit to earning a Certificate—it's a trusted, shareable way to showcase your new skills.

About this course: This is a master course given in Moscow at the Laboratory of Algebraic Geometry of the National Research University Higher School of Economics by Valery Gritsenko, a professor of University Lille 1, France. Jacobi forms are holomorphic functions in two complex variables. They are modular in one variable and abelian (or double periodic) in another variable. The theory of Jacobi modular forms became an independent research subject after the famous book of Martin Eichler and Don Zagier “Jacobi modular forms” (Progress in Mathematics, vol. 55, 1985) which was cited more than a thousand times in research papers. This is due to many applications of Jacobi forms in arithmetic, topology, algebraic and differential geometry, mathematical and theoretical physics, in the theory of Lie algebras, etc. The list of mentioned subjects shows that my course might be useful for master and Ph.D. students working in different directions. Motivated undergraduate students can also study this subject. To follow the course one has to know only elementary basic facts from the theory of modular forms (for example, the paragraphs 1-4 of the chapter VII of Serre’s “A Course in Arithmetic” are enough). The main hero of the course is the Jacobi theta-series. Using it we will construct a lot of concrete examples of Jacobi forms in one or many abelian variables, in particular, Jacobi forms for root systems. For some of you, who will be successful with the theoretical exercises of the course, I am ready to formulate research problems for Master or Ph.D. thesis. (Ph.D. support might be available at CEMPI in Lille or at the Faculty of Mathematics of National Research University Higher School of Economics in Moscow)

Created by:  Higher School of Economics
  • Taught by:  Valery Gritsenko

    Laboratory of Algebraic Geometry and its Applications
Level Advanced Commitment 12 weeks of study, 3-5 hours per week Language English How To Pass Pass all graded assignments to complete the course. User Ratings 4.5 stars Average User Rating 4.5See what learners said Travail en cours

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Syllabus


WEEK 1


Introduction to the Course



Welcome to the course! I hope you have an opportunity to reserve some time to explore the course content, course logic and our grading policy. The course consists of 12 lectures. This course will help you to start your progress in the field of the theory of Jacobi modular forms. Best regards, Valery Gritsenko


1 video, 5 readings expand


  1. Video: About the Course
  2. Lecture: Pre-Course Survey
  3. Lecture: Course Overview
  4. Lecture: Grading and Logistics
  5. Lecture: Suggested Readings
  6. Lecture: About the Instructor


Jacobi modular forms: motivations
This module is devoted to motivations to study Jacobi forms. We provide some first examples including theta-functions. Also there is a peer review in the end of this module.


5 videos expand


  1. Video: Motivations
  2. Video: Theta-function
  3. Video: Modular and abelian transformations
  4. Video: Pullbacks of theta-function
  5. Video: Modular forms

Graded: Exercises 1

WEEK 2


Jacobi modular forms: the first definition
This module is devoted to the first definition of Jacobi forms. In this module we also define Jacobi modular group. Also there is a peer review in the end of this module.


6 videos expand


  1. Video: Definition of Jacobi forms
  2. Video: Definition of Jacobi forms (part 2)
  3. Video: Basic properties of Jacobi forms
  4. Video: Jacobi modular group
  5. Video: Symplectic group
  6. Video: Jacobi modular group (part 2)

Graded: Exercises 2

WEEK 3


Jacobi modular group and the second definition of Jacobi forms. Special values of Jacobi modular forms
This module is devoted to the second definition of Jacobi forms. In this module we also consider special values of Jacobi forms. Also there is a peer review in the end of this module.


6 videos expand


  1. Video: Heisenberg group
  2. Video: The action of Jacobi modular group
  3. Video: The action of Jacobi modular group (part 2)
  4. Video: The second definition of Jacobi forms
  5. Video: Special values of Jacobi forms
  6. Video: The first theorem

Graded: Exercises 3

WEEK 4


Zeros of Jacobi forms. The Jacobi theta-series, the Dedekind eta-function and the first examples of Jacobi modular forms



This module is devoted to zeros of Jacobi modular forms, their Taylor extensions and the first examples of Jacobi forms. Using classical Jacobi theta-series and Dedekind eta-function we construct a series of Jacobi forms. Also there is a peer review in the end of this module.


6 videos expand


  1. Video: The zeros of elliptic functions
  2. Video: The zeros of Jacobi forms (part 2)
  3. Video: Taylor expansion of Jacobi forms
  4. Video: Taylor expansion of Jacobi forms (part 2)
  5. Video: Dimensions of some spaces of Jacobi forms
  6. Video: Examples of Jacobi modular forms

Graded: Exercises 4

WEEK 5


The Jacobi theta-series as Jacobi modular form. The basic Jacobi modular forms
This module is devoted to detailed study of Jacobi theta-series. We will discuss abelian, modular and some other properties of this function. Also there is a peer review in the end of this module.


6 videos expand


  1. Video: Examples of Jacobi forms (part 2)
  2. Video: Properties of Jacobi theta-function
  3. Video: Properties of Jacobi theta-function (part 2)
  4. Video: Properties of Jacobi theta-function (part 3)
  5. Video: Construction of Jacobi forms using theta-series
  6. Video: Construction of Jacobi forms using theta-series (part 2)

Graded: Exercises 5

WEEK 6


Theta-blocks, theta-quarks and the first Jacobi cusp form of weight 2
This module is devoted to very important notion of theta-blocks and theta-quarks. In this module we also construct the first Jacobi form of weight 2. Also there is a peer review in the end of this module.


7 videos expand


  1. Video: Theta-blocks
  2. Video: Theta-blocks (part 2)
  3. Video: Theta-quarks
  4. Video: Dimension of the space of Jacobi forms of odd weight
  5. Video: Theta-quarks (part 2)
  6. Video: The proof of theorem about theta-quarks
  7. Video: The first Jacobi cusp form of weight 2

Graded: Exercises 6

WEEK 7


Jacobi forms in many variables and the Eichler-Zagier Jacobi forms
This module is devoted to Jacobi forms in many variables. In this module we also define classical Eichler-Zagier Jacobi forms in terms of Jacobi forms in many variables. Also there is a peer review in the end of this module.


6 videos expand


  1. Video: Jacobi theta-series and Jacobi forms in many variables
  2. Video: Jacobi theta-series and Jacobi forms in many variables (part 2)
  3. Video: Hyperbolic reformulation
  4. Video: Examples of Jacobi forms in many variables
  5. Video: Examples of Jacobi forms in many variables (part 2)
  6. Video: Examples of Jacobi forms in many variables (part 3)

Graded: Exercises 7

WEEK 8


Jacobi forms in many variables and the splitting principle. Theta-quarks as a pull-back. Weak Jacobi forms in many variables
In this module we continue studying Jacobi forms in many variables. Among other things we discuss splitting principle and realize theta-quarks as a pull-back. Also there is a peer review in the end of this module.


6 videos expand


  1. Video: Theta-quarks as pull-backs of Jacobi forms
  2. Video: Theta-quarks as pull-backs of Jacobi forms (part 2)
  3. Video: Theta-quarks as pull-backs of Jacobi forms (part 3)
  4. Video: The splitting principle
  5. Video: The splitting principle (part 2)
  6. Video: Weak Jacobi forms in many variables

Graded: Exercises 8

WEEK 9


The Weil representation and vector valued modular forms. Jacobi forms of singular weight
This module is devoted to very useful notion of the Weil representation and vector-valued modular forms. In this module we also define Jacobi forms of singular weight. Also there is a peer review in the end of this module.


6 videos expand


  1. Video: The Weil representation
  2. Video: The Weil representation (part 2)
  3. Video: Jacobi forms of singular weight
  4. Video: Jacobi forms of singular weight (part 2)
  5. Video: Jacobi forms of critical weight
  6. Video: Jacobi forms of critical weight (part 2)

Graded: Exercises 9

WEEK 10


Quasi-modular Eisenstein series. The automorphic correction of Jacobi forms and Taylor expansions



This module is devoted to Quasi-modular Eisenstein series. In this module we also define the automorpic correction of Jacobi forms and its Taylor expansion that gives us the way to construct the series of Jacobi forms. Also there is a peer review in the end of this module.


6 videos expand


  1. Video: Automorpic correction
  2. Video: Differential operator D
  3. Video: Quasi-modular Eisenstein series
  4. Video: Automorphic correction and Taylor expansions
  5. Video: Automorphic correction of Jacobi forms in many variables
  6. Video: Automorphic correction of Jacobi forms in many variables (part 2)

Graded: Exercises 10

WEEK 11


Modular differential operators. The graded ring of the weak Jacobi modular forms
This module is devoted to Modular differential operators. In this module we also consider the Jacobi forms as the space with the structure of the bigraded ring. Also there is a peer review in the end of this module.


6 videos expand


  1. Video: Modular differential operators for Jacobi forms
  2. Video: Heat operator
  3. Video: Heat operator (part 2)
  4. Video: Applications of differential operators for Jacobi forms
  5. Video: The graded ring of the weak Jacobi modular forms
  6. Video: Jacobi type forms in many variables

Graded: Exercises 11

WEEK 12


Jacobi type forms and the generalisation of the Cohen-Kuznetsov-Zagier operator
The last module is devoted to Jacobi type forms. In this module we also consider the generalisation of the Cohen-Kuznetsov-Zagier operator. Also there is a peer review in the end of this module.


4 videos expand


  1. Video: A new proof of Cohen-Kuznetsov-Zagier theorem
  2. Video: A new proof of Cohen-Kuznetsov-Zagier theorem
  3. Video: A new proof of Cohen-Kuznetsov-Zagier theorem (part 2)
  4. Video: Cohen-Kuznetsov-Zagier theorem in case of many variables

Graded: Exercises 12

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