Unirationality and existence of infinitely transitive models

Details Unirationality and existence of infinitely transitive models Unirationality and existence of infinitely transitive models

2012-04-04

arxiv.org/abs/1204.0862v1

Mathematics

Algebraic Geometry

Scientific paper

We study unirational algebraic varieties and the fields of rational functions on them. We show that after adding a finite number of variables some of these fields admit an \emph{infinitely transitive model}. The latter is an algebraic variety with the given field of rational functions and an infinitely transitive regular action of an algebraic group generated by unipotent algebraic subgroups. We expect this property holds for all unirational varieties and in fact is a peculiar one for this class of algebraic varieties among those varieties which are rationally connected.

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