On Clifford theory with Galois action
Group Theory
2016-04-26 v3 Representation Theory
Abstract
Let be a finite group, a normal subgroup of and . Let be a subfield of the complex numbers and assume that the Galois orbit of over is invariant in . We show that there is another triple of the same form, such that the character theories of over and of over are essentially "the same" over the field and such that the following holds: has a cyclic normal subgroup contained in , such that for some linear character of , and such that is isomorphic to the (abelian) Galois group of the field extension . More precisely, "the same" means that both triples yield the same element of the Brauer-Clifford group defined by A. Turull.
Keywords
Cite
@article{arxiv.1409.3559,
title = {On Clifford theory with Galois action},
author = {Frieder Ladisch},
journal= {arXiv preprint arXiv:1409.3559},
year = {2016}
}
Comments
v3: Referee's comments included, and a few other small corrections