BASIC NOTIONS OF INVARIANT THEORY
AND
ITS APPLICATIONS TO MODULI


SHORT COURSE
by IAN MORRISON


Tarihler: 25 April 2014 – 21 May 2014
Yer:  Galatasaray Üniversitesi FEF 10

Organizer:
Ayberk Zeytin, İrem Portakal


In order to attend, please send an e-mail to ayberkz [the symbol at] gmail [dot] com

 

I will first review basic results about invariants of actions of algebraic group, especially reductive ones (finite generation of rings of invariants, separation by invariants, linearization). Then I will discuss closure of orbits, surjectivity properties of quotients and the notions of good and geometric quotients, and the Hilbert-Mumford numerical criterion for stability.

In the last week, I will explain how the theory from the first part is worked out for Hilbert points of pluricanonical curves and what this is good for. I will explain what a moduli space is, using the moduli space $M_g$ of smooth curves of genus $g$ as a model, and why finding compactifications of moduli spaces is important. Then I will sketch how the moduli space $\overline{M}_g$ of stable curves is constructed as a GIT quotient and how variants of this construction give rise both to log minimal models arising in the Hassett-Keel program and to alternate compactifications of $M_g$. These variants call for new techniques that will be the subject of my Colloquium talk.

The initial lectures will be largely self-contained; the later ones will use some black boxes, notably the construction of the Hilbert scheme.

These lectures will be a preparation for Ian Morrison's general seminar which will be held on 28th May, 2014 at Galatasaray University.
Introductory Courses
25 April 2014 Friday 13.30 --- Notes 1
30 April 2014 Wednesday 16.30 --- Notes 2-3
2 May 2014 Friday 13.30
7 May 2014 Wednesday 16.30
Advanced Courses
16 May 2014 Friday 13.30
21 May 2014 Wednesday 16.30





GSÜ//GIT
Spec(IM)