Primitive Ideal Space of $C^*(R_+)\rtimes R^\times$

TL;DR

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Contribution

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Abstract

For an integral domain $R$ satisfying certain condition, we characterize the primitive ideal space and its Jacobson topology of the semigroup crossed product $C^*(R_+) \rtimes R^\times$. The main example is when $R=\mathbb{Z}[\sqrt{-3}]$.