Going-down functors and the Künneth formula for crossed products by étale groupoids

Going-down functors and the Künneth formula for crossed products by étale groupoids
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下落函子和 étale groupoids 交叉乘积的 Künneth 公式

DOI:
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发表时间:
2018
影响因子:
1.3
通讯作者:
Cl'ement Dell'Aiera
Cl'ement Dell'Aiera
中科院分区:
数学1区
文献类型:
--
作者:
Christian Bonicke;Cl'ement Dell'Aiera

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我们研究了大群群的鲍姆-康尼斯猜想之间的联系 G G 有系数 一个 一个 以及 Künneth 公式 K {\mathrm K} - 叉积的张量积理论 一个 ⋊ r G A\r次_r G 。为此,我们为大量群群开发了下降函子机制。作为应用,我们证明了均匀嵌入Hilbert空间的粗空间的一致Roe代数和允许纤维粗嵌入Hilbert空间的空间的最大Roe代数都满足Künneth公式。此外,我们给出了一个空间的例子,该空间不允许在希尔伯特空间中进行粗嵌入,但其一致的 Roe 代数满足 Künneth 公式,并使用受控的 Künneth 公式提供了稳定性结果 K {\mathrm K} -理论。作为我们方法的副产品,我们还证明了鲍姆-康尼斯猜想关于系数代数的等变归纳极限的持久性。
We study the connection between the Baum–Connes conjecture for an ample groupoid G G with coefficient A A and the Künneth formula for the K {\mathrm K} -theory of tensor products by the crossed product A ⋊ r G A\rtimes _r G . To do so, we develop the machinery of going-down functors for ample groupoids. As an application, we prove that both the uniform Roe algebra of a coarse space which uniformly embeds in a Hilbert space and the maximal Roe algebra of a space admitting a fibered coarse embedding in a Hilbert space satisfy the Künneth formula. Additionally, we give an example of a space that does not admit a coarse embedding in a Hilbert space, but whose uniform Roe algebra satisfies the Künneth formula and provides a stability result for the Künneth formula using controlled K {\mathrm K} -theory. As a byproduct of our methods, we also prove a permanence property for the Baum–Connes conjecture with respect to equivariant inductive limits of the coefficient algebra.