Semisimple Hopf actions on commutative domains
Semisimple Hopf actions on commutative domains
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DOI:
10.1016/j.aim.2013.10.008
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发表时间:
2013-01
影响因子:
1.7
通讯作者:
P. Etingof;Chelsea M. Walton
中科院分区:
文献类型:
--
作者:
P. Etingof;Chelsea M. Walton
LetHbe a semisimple (so, finite dimensional) Hopf algebra over an algebraically closed fieldkof characteristic zero and letAbe a commutative domain overk. We show that ifAarises as anH-module algebra via an inner faithfulH-action, thenHmust be a group algebra. This answers a question of E. Kirkman and J. Kuzmanovich and partially answers a question of M. Cohen.The main results of this article extend to working overkof positive characteristic. On the other hand, we obtain results on Hopf actions on Weyl algebras as a consequence of the main theorem.