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We study $\textrm{AdS}_2\times S^4 \times S^2 \times \Sigma_2$ solutions intype IIB string theory arising from D1 -- D3 -- NS5 brane intersections. Thesebackgrounds enjoy sixteen supercharges and the corresponding internal geometryis non-compact due to the specific form of the warping w.r.t. the Riemannsurface $\Sigma_2$. Even though a direct computation of the holographic freeenergy of the would-be dual CFT$_1$ yields a divergent behaviour, it revealsthe typical $N^3$ scaling of a 6d theory upon introducing a hard cut-off. Weclaim that such geometries may be interpreted as the gravity duals of M(atrix)models describing an IR phase of the $(2,0)$ theory of M5 branes, in presenceof momentum and NUT charges. We discuss parallel $\textrm{AdS}_2$ geometriesdescribing longitudinal M2 branes in the UV, where the counting of the numberof degrees of freedom correctly reproduces the expected $N^{3/2}$ behaviour ofthe dual field theory. These geometries provide explicit examples wheredeconstructed extra dimensions yield well-defined UV descriptions in terms ofhigher-dimensional CFTs.

Holographic Description of M-branes via AdS$_2$