MS Seminar (Mathematics - String Theory)

Speaker: Misha Verbitsky (HSE, National Research University)
Title: Trihyperkaehler reduction
Date: Tue, Jan 24, 2012, 15:30 - 17:00
Place: Seminar Room A
Related File: 618.pdf
Abstract: We define a trisymplectic reduction of a trisymplectic manifold, which is a complexified form of a hyperkaehler reduction. We prove that the trisymplectic reduction in the space of regular rational curves on the twistor space of a hyperkaehler manifold M is compatible with the hyperkaehler reduction on M. As an application of these geometric ideas, we consider the ADHM construction of instantons and show that the moduli space of rank r, charge c framed instanton bundles on CP^3 is a smooth, connected, trisymplectic manifold of complex dimension 4rc. In particular, it follows that the moduli space of rank 2, charge c instanton bundles on CP^3 is a smooth complex manifold of dimension 8c-3, thus settling a 30-year old conjecture.