D-modules

TCC course. Thursdays 10:00 to 12:00 starting on October 15.
Lecturer: Clemens Koppensteiner, clemens.koppensteiner@maths.ox.ac.uk

Synopsis

D-modules are quasi-coherent sheaves with an action of vector fields, or, in other words, integrable connections which are not required to be vector bundles. Thus they link the geometry, analysis and topology of complex varieties or manifolds. They are central objects of study in geometry, but have also found crucial application in other areas, such as representation theory.

In this course we will cover the theory of D-modules on complex algebraic varieties, working towards (a sketch of) the proof of the Riemann-Hilbert correspondence. The goal is to give good foundations of the theory in this setting, which can then be expanded upon. Due to time constraints we will not be able to go into applications of the theory, though some may be touched upon in exercise sheets.

Prerequisites: Complex varieties. Sheaf theory. A basic understanding of homological algebra and, ideally, derived categories.

Assessment

There will be exercise sheets. For pass/fail grades I want to see reasonable progress on at least two of the sheets. Numerical grades will depend on the quality of the solutions. Please contact me with details of your grade requirements.

[Exercise sheet 1] (good filtrations will be introduced in the next lecture)

Notes

Version of October 29, 2020: [PDF] [Github]

References

The course will loosely follow the book Further references are given in the notes.

Outline

Date Topics Slides
Oct 15 D-modules: Basic properties and examples; pullback functor [PDF]
Oct 22 Pushforward functor; Kashiwara's Equivalence [PDF]
Oct 29 Base change; coherent D-modules and duality; filtered rings [PDF]
Characteristic varieties; holonomic D-modules I
Holonomic D-modules II
Analytic D-modules and the de Rham functor
Regularity. Constructible sheaves
Riemann-Hilbert Correspondence. Perverse sheaves