Twisted coarse Baum–Connes conjecture with coefficients

Let XX be a metric space with bounded geometry, let Pd(X)P_d(X) be its Rips complex at scale dd, and let Γ(X,A)\Gamma(X,\mathcal A) be a coarse XX-algebra. The twisted assembly map is

μΓ(X,A):limdK(CL,Γ(X,A)(Pd(X),A))K(CΓ(X,A)(X,A)).\mu_{\Gamma(X,\mathcal A)}:\lim_{d\to\infty}K_*(C^*_{L,\Gamma(X,\mathcal A)}(P_d(X),\mathcal A))\to K_*(C^*_{\Gamma(X,\mathcal A)}(X,\mathcal A)).

Here CL,Γ(X,A)(Pd(X),A)C^*_{L,\Gamma(X,\mathcal A)}(P_d(X),\mathcal A) is the twisted localization algebra and CΓ(X,A)(X,A)C^*_{\Gamma(X,\mathcal A)}(X,\mathcal A) is the twisted Roe algebra with coefficients in Γ(X,A)\Gamma(X,\mathcal A). Twisted coarse Baum–Connes conjecture with coefficients. For every coarse XX-algebra Γ(X,A)\Gamma(X,\mathcal A), the map μΓ(X,A)\mu_{\Gamma(X,\mathcal A)} is an isomorphism. The paper proves this conjecture for spaces with suitable coarse-fibration structures, including cases whose base and fiber satisfy the corresponding conjecture; its general status is not resolved here.

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Primary source

Jintao Deng and Liang Guo, “Twisted Roe algebras and their K-theory”, arXiv:2409.16556 (2025).

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