English

On generic $G$-graded Azumaya algebras

Rings and Algebras 2022-02-08 v3

Abstract

Let FF be an algebraically closed field of characteristic zero and let GG be a finite group. Consider GG-graded simple algebras AA which are finite dimensional and ee-central over FF, i.e. Z(A)e:=Z(A)Ae=FZ(A)_{e} := Z(A)\cap A_{e} = F. For any such algebra we construct a \textit{generic} GG-graded algebra U\mathcal{U} which is \textit{Azumaya} in the following sense. (1)(1) \textit{((Correspondence of ideals))}: There is one to one correspondence between the GG-graded ideals of U\mathcal{U} and the ideals of the ring RR, the ee-center of U\mathcal{U}. (2)(2) \textit{Artin-Procesi condition}: U\mathcal{U} satisfies the GG-graded identities of AA and no nonzero GG-graded homomorphic image of U\mathcal{U} satisfies properly more identities. (3)(3) \textit{Generic}: If BB is a GG-graded algebra over a field then it is a specialization of U\mathcal{U} along an ideal aspec(Z(U)e)\mathfrak{a} \in spec(Z(\mathcal{U})_{e}) if and only if it is a GG-graded form of AA over its ee-center. We apply this to characterize finite dimensional GG-graded simple algebras over FF that admit a GG-graded division algebra form over their ee-center.

Keywords

Cite

@article{arxiv.2008.00976,
  title  = {On generic $G$-graded Azumaya algebras},
  author = {Eli Aljadeff and Yakov Karasik},
  journal= {arXiv preprint arXiv:2008.00976},
  year   = {2022}
}

Comments

35 pages

R2 v1 2026-06-23T17:36:26.282Z