The relative coarse Baum–Connes and relative coarse Novikov conjectures

Let XX be a metric space with bounded geometry and let YXY\subseteq X be a subspace. The relative coarse assembly map is

μY,:limdK(CL,Y,(Pd(X)))K(CY,(X)).\mu_{Y,\infty}:\lim_{d\to\infty}K_*(C^*_{L,Y,\infty}(P_d(X)))\to K_*(C^*_{Y,\infty}(X)).

Relative coarse Baum–Connes and relative coarse Novikov conjectures. The relative coarse Baum–Connes conjecture for (X,Y)(X,Y) claims that μY,\mu_{Y,\infty} is an isomorphism, while the relative coarse Novikov conjecture for (X,Y)(X,Y) claims that μY,\mu_{Y,\infty} is injective. These are relative analogues of the coarse Baum–Connes and coarse Novikov conjectures, formulated using localization algebras at infinity. The supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Liang Guo, Qin Wang and Chen Zhang, “Relative higher index theory on quotients of Roe algebras and positive scalar curvature at infinity”, arXiv:2509.23380 (2025).

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