Non-amenable simple C*-algebras with tracial approximation

Abstract

We construct two types of unital separable simple $C^{\ast }$-alebras $A_z^{C_1}$ and $A_z^{C_2},$ one is exact but not amenable, and the other is non-exact. Both have the same Elliott invariant as the Jiang-Su algebra, namely, $A_z^{C_i}$ has a unique tracial state, $$(K_0(A_z^{C_i}),K_0(A_z^{C_i}{)}_{+},[1_{A_z^{C_i}}])=(\mathbb{Z},{\mathbb{Z}}_{+},1)$$ and $K_1(A_z^{C_i})=\{0\}$ ($i=1,2$). We show that $A_z^{C_i}$ ($i=1,2$) is essentially tracially in the class of separable $\mathcal{Z}$-stable $C^{\ast }$-alebras of nuclear dimension 1. $A_z^{C_i}$ has stable rank one, strict comparison for positive elements and no 2-quasitrace other than the unique tracial state. We also produce models of unital separable simple non-exact $C^{\ast }$-alebras which are essentially tracially in the class of simple separable nuclear $\mathcal{Z}$-stable $C^{\ast }$-alebras and the models exhaust all possible weakly unperforated Elliott invariants. We also discuss some basic properties of essential tracial approximation.