Caroline Lassueur, Gunter Malle, Elisabeth Schulte
Published 2013-05-15, updated 2013-09-24Version 3
We investigate simple endotrivial modules of finite quasi-simple groups and classify them in several important cases. This is motivated by a recent result of Robinson showing that simple endotrivial modules of most groups come from quasi-simple groups.
Comments: 31 pages. Changes from (v1): in Theorem 1.3, we removed the assumption that G<SL and proved that endotrivial modules are liftable to characteristic zero in all generality. (v3): revised version, to appear in Journal f\"ur die Reine und Angewandte Mathematik
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