SMS scnews item created by James East at Tue 21 Jul 2009 1020
Type: Seminar
Distribution: World
Expiry: 24 Jul 2009
Calendar1: 24 Jul 2009 1205-1255
CalLoc1: Carslaw 375
Auth: jamese@bari.maths.usyd.edu.au

Algebra Seminar

Arc spaces and equivariant cohomology

Alan Stapledon

Friday July 24, 12:05--12:55pm, Carslaw 375

Abstract

We present a new geometric interpretation of equivariant cohomology in which one replaces a smooth, complex G-variety X by its associated arc space J_{\infty} X, with its induced G-action. This not only allows us to obtain geometric classes in equivariant cohomology of arbitrarily high degree, but also provides more flexibility for equivariantly deforming classes and geometrically interpreting multiplication in the equivariant cohomology ring. As applications, we present geometric Z-bases for the equivariant cohomology ring of a smooth toric variety and the equivariant cohomology ring of the general linear group acting on a point.

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After the seminar we will take the speaker to lunch.

See the Algebra Seminar web page for information about other seminars in the series.

James East jamese@maths.usyd.edu.au


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