Fuzzy cold dark matter
Fuzzy cold dark matter is a hypothetical form of
scalar particles
with masses on the order of eV; so a 
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.
New research (2023) has uncovered evidence that fuzzy dark matter, specifically ultralight axions, may better fit gravitational lens data than WIMP dark matter.[6]
Notes
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