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Vector bundles on the algebraic 5-sphere and punctured affine 3-space

Presented by: 
J Yu ETH Zürich
Date: 
Tuesday 24th May 2011 - 11:30 to 12:30
Venue: 
INI Seminar Room 1
Abstract: 
The 5-dimensional complex sphere X is isomorphic to SL_3/S_2, which admits a fibration p: X-->Y to the 3-dimensional punctured affine space Y=C^{3}\{0} with C^{2} fibres. It was shown by Fabien Morel that vector bundles on a smooth affine variety are determined by A^{1}-homotopy classes of maps to BGL. The fibration p is an A^{1}-homotopy weak equivalence but the Y above is not affine, so it is natural to look for non-isomorphic vector bundles on Y with isomorphic pull-backs to X. We give interesting examples of such bundles of any rank bigger than 1. The examples are produced from vector bundles on the projective space P=P^2.
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