Cartan subalgebras and the UCT problem
Cartan subalgebras and the UCT problem
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嘉当子代数和 UCT 问题
DOI:
10.1016/j.aim.2017.06.024
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发表时间:
2017
影响因子:
1.7
通讯作者:
Barlak S
中科院分区:
文献类型:
--
作者:
Barlak S
We show that a separable, nuclear C*-algebra satisfies the UCT if it has a Cartan subalgebra. Furthermore, we prove that the UCT is closed under crossed products by group actions which respect Cartan subalgebras. This observation allows us to deduce, among other things, that a crossed product O 2⋊ α Z p satisfies the UCT if there is some automorphism γ of O 2 with the property that γ (D 2)⊆ O 2⋊ α Z p is regular, where D 2 denotes the canonical masa of O 2. We prove that this condition is automatic if γ (D 2)⊆ O 2⋊ α Z p is not a masa or α (γ (D 2)) is inner conjugate to γ (D 2). Finally, we relate the UCT problem for separable, nuclear, M 2∞-absorbing C*-algebras to Cartan subalgebras and order two automorphisms of O 2.
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