The ℓᵖ-localization-algebra formulation of the coarse Baum–Connes conjecture

Let XX be a locally finite metric space with bounded geometry, let Pr(X)P_r(X) be its Rips complex at scale rr, let CLp(Pr(X))C^p_L(P_r(X)) be the p\ell^p-localization algebra, and let Cp(X)C^p(X) be the p\ell^p-Roe algebra. The evaluation map

ev ⁣:CLp(Pr(X))Cp(X)\operatorname{ev}\colon C^p_L(P_r(X))\to C^p(X)

that sends ff to f(0)f(0) induces

ev ⁣:limrK(CLp(Pr(X)))K(Cp(X)).\operatorname{ev}_*\colon \lim_{r\to\infty}K_*(C^p_L(P_r(X)))\to K_*(C^p(X)).

The p\ell^p-coarse Baum–Connes conjecture. The induced map ev\operatorname{ev}_* is a K-theoretic isomorphism. This is the p\ell^p localization-algebra formulation of the conjecture; the source notes coarse-equivalence invariance of the relevant K-theory but supplies no resolution status for the general assertion.

Sources & referencesView supporting material

Primary source

Jinmin Wang, Zhizhang Xie, Guoliang Yu and Bo Zhu, “^p-coarse Baum-Connes conjecture for ^q-coarse embeddable spaces”, arXiv:2411.15070 (2025).

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