Centralizers of sections of a reductive group scheme

arXiv Math

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Abstract

This paper proves a number of flatness results for centralizers of sections of a reductive group scheme over a general base scheme.

To this end, we establish relative versions of the Jordan decomposition.

Using our results, we obtain a canonical flattening stratification for the universal centralizer of a simply connected semisimple group scheme over a base of good characteristic.

We also investigate the structure of centralizers and conjugacy classes of unipotent and nilpotent sections over general bases.

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Centralizers of sections of a reductive group scheme

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