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The local structure of G-varieties

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  • UserBen Martin (Auckland)
  • ClockWednesday 13 November 2013, 16:30-17:30
  • HouseMR12.

If you have a question about this talk, please contact Christopher Brookes .

Let G be a reductive algebraic group acting on an affine variety V. A key problem in geometric invariant theory is to understand the structure of the quotient variety V/G and the behaviour of the orbits and stabilisers. Luna’s etale slice theorem is a powerful tool: very roughly, this says that V is locally isomorphic to GxS, where S is a subvariety of V, and V/G is locally isomorphic to S. The slice theorem yields information about stabilisers of points.

Unfortunately, the hypotheses necessary to apply the slice theorem do not always hold. I will discuss some other approaches for studying stabilisers and orbits. I will also briefly describe a project (joint with Guralnick, Lawther, Liebeck, Saxl and Testerman) to classify the irreducible G-modules having no regular G-orbit.

This talk is part of the Algebra and Representation Theory Seminar series.

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Lecture room 4, Engineering Department, Trumpington street, Cambridge Average on Saturdays: 7547.15178571 kWh James Fawcett Seminar Room, van Geest Building (formerly 'the library').

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