Fuzzy cold dark matter is a hypothetical form of cold dark matter proposed to solve the cuspy halo problem. It would consist of extremely light scalar particles with masses on the order of eV; so a Compton wavelength on the order of 1 light year. Fuzzy cold dark matter halos in dwarf galaxies would manifest wave behavior on astrophysical scales, and the cusps would be avoided through the Heisenberg uncertainty principle.[1] The wave behavior leads to interference patterns, spherical soliton cores in dark matter halo centers,[2] and cylindrical soliton-like cores in dark matter cosmic web filaments.[3]
Fuzzy cold dark matter is a limit of scalar field dark matter without self-interaction.[4][5] It is governed by the Schrödinger–Poisson equation.
https://en.wikipedia.org/wiki/Fuzzy_cold_dark_matter
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