A multiplicative analogue of complex symplectic implosion
Abstract
We introduce a multiplicative version of complex-symplectic implosion in the case of SL(n, ). The universal multiplicative implosion for SL(n, ) is an affine variety and can be viewed as a nonreductive geometric invariant theory quotient. It carries a torus action. and reductions by this action give the Steinberg fibres of SL(n, ). We also explain how the real symplectic group-valued universal implosion introduced by Hurtubise, Jeffrey and Sjamaar may be identified inside this space.
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