中文

UHF-代数上圆周作用的等变高阶Dixmier-Douady理论

算子代数 2023-11-27 v2 代数拓扑

摘要

我们为纤维为DKD \otimes \mathbb{K}且配备逐纤维T\mathbb{T}-作用的CC^*-代数局部平凡丛发展了等变Dixmier-Douady理论,其中T\mathbb{T}表示圆周群,且对于T\mathbb{T}-表示VVD=End(V)D = \operatorname{End}\left(V\right)^{\otimes \infty}。特别地,我们证明了T\mathbb{T}-等变*-自同构群AutT(DK)\operatorname{Aut}_{\mathbb{T}}(D \otimes \mathbb{K})是一个无穷环空间,产生上同调理论ED,T(X)E^*_{D,\mathbb{T}}(X)。等变丛的同构类在逐纤维张量积下形成一个群,该群同构于ED,T1(X)[X,BAutT(DK)]E^1_{D,\mathbb{T}}(X) \cong [X, B\operatorname{Aut}_{\mathbb{T}}(D \otimes \mathbb{K})]。我们计算了环面的该群,并将D=CD = \mathbb{C}的情形与底空间上平凡作用的等变Brauer群进行了比较。

关键词

引用

@article{arxiv.2201.13364,
  title  = {Equivariant higher Dixmier-Douady Theory for circle actions on UHF-algebras},
  author = {David E. Evans and Ulrich Pennig},
  journal= {arXiv preprint arXiv:2201.13364},
  year   = {2023}
}

备注

37 pages, published version (except for a typo in the description of the order structure on page 19 and the proof of Lemma 3.5, which was fixed after publication, and did not change the main result)