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An excess of gamma rays has been identified at the centre of the Milky Way,and annihilation of dark matter has been posited as a potential source. Thishypothesis faces significant challenges: difficulty characterizingastrophysical backgrounds, the need for a non-trivial adiabatic contraction ofthe inner part of the Milky Way's dark matter halo, and recent observations ofphoton clustering, which suggest that the majority of the excess is due tounresolved point sources. Here we point out that the apparent point-like natureof the emission rules out the dark matter interpretation of the excessentirely. Attempting to model the emission with dark matter point sourceseither worsens the problem with the inner slope, requires an unrealisticallylarge minihalo fraction toward the Galactic Centre, or overproduces theobserved emission at higher latitudes.

Dark matter substructure cannot explain properties of the Fermi Galactic Centre excess