Niveau: Supérieur, Doctorat, Bac+8
An introduction to moduli spaces of curves and its intersection theory Dimitri Zvonkine? Institut mathematique de Jussieu, Universite Paris VI, 175, rue du Chevaleret, 75013 Paris, France. Stanford University, Department of Mathematics, building 380, Stanford, California 94305, USA. e-mail: Abstract. The material of this chapter is based on a series of three lectures for graduate students that the author gave at the Journees mathematiques de Glanon in July 2006. We introduce moduli spaces of smooth and stable curves, the tauto- logical cohomology classes on these spaces, and explain how to compute all possible intersection numbers between these classes. 0 Introduction This chapter is an introduction to the intersection theory on moduli spaces of curves. It is meant to be as elementary as possible, but still reasonably short. The intersection theory of an algebraic variety M looks for answers to the following questions: What are the interesting cycles (algebraic subvarieties) of M and what cohomology classes do they represent? What are the interesting vector bundles over M and what are their characteristic classes? Can we describe the full cohomology ring of M and identify the above classes in this ring? Can we compute their intersection numbers? In the case of moduli space, the full cohomology ring is still unknown. We are going to study its subring called the “tautological ring” that contains the classes of most interesting cycles and the characteristic classes of most interesting vector bundles.
- all intersection
- isomorphism
- deligne-mumford compactification
- intersection theory
- every step
- complex curve has
- marked point