The relative coarse Baum–Connes and relative coarse Novikov conjectures

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

μY,∞:lim⁡d→∞K∗(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.

References

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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