Bass-Serre Trees of Amalgamated Free Product C*-algebras
Bass-Serre Trees of Amalgamated Free Product C*-algebras
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合并自由积 C* 代数的 Bass-Serre 树
DOI:
10.1093/imrn/rnx312
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发表时间:
2018
期刊:
影响因子:
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通讯作者:
Hasegawa Kei
中科院分区:
文献类型:
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作者:
橋本陽;藤本龍介;田中和明;日本菌学会(分担執筆:橋本陽ほか41名);Hasegawa Kei
For any reduced amalgamated free product C*-algebra (A,E) = (A1,E1) *D(A2,E2), we introduce and study a canonical ambient C*-algebra ΔT(A,E) ofAwhich generalizes the crossed product arising from the canonical action of an amalgamated free product group on the compactification of the associated Bass–Serre tree. Using an explicit identification of ΔT(A,E) with a Cuntz–Pimsner algebra we prove two kinds of “amenability” results for ΔT(A,E); nuclearity and universality. As applications of our framework, we provide new conceptual, and simpler proofs of several known theorems on approximation properties, embeddability, andKK-theory for reduced amalgamated free product C*-algebras.