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*Universe*, Volume 9, Issue 7 (July 2023) – 47 articles

**Cover Story**(view full-size image): What if dark matter interacted non-locally with gravity? We investigate this possibility by exploiting fractional calculus, i.e., the branch of mathematics that deals with the differentiation and integration of non-integer order, and specifically by considering a modified Poisson equation with fractional derivatives. We recently showed that such a framework can accurately reproduce the kinematics of disk-dominated galaxies, especially dwarfs. We now further test fractional gravity in the largest structures of the cosmos: galaxy clusters. All in all, we pinpoint the strength of non-locality over six orders of magnitude in dark matter mass. The resulting trend implies that fractional gravity can substantially alleviate the small-scale issues of the standard dark matter paradigm while retaining its successes on large cosmological scales. View this paper

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