Hypothetical form of cold dark matter proposed to solve the cuspy halo problem
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.
New research (2023) has uncovered evidence that fuzzy dark matter, specifically ultralight axions, may better fit gravitational lens data than WIMP dark matter.[6]
^Hu, Wayne; Barkana, Rennan; Gruzinov, Andrei (2000). "Cold and Fuzzy Dark Matter". Physical Review Letters. 85 (6): 1158–61. arXiv:astro-ph/0003365. Bibcode:2000PhRvL..85.1158H. doi:10.1103/PhysRevLett.85.1158. PMID 10991501. S2CID 118938504.
^Schive, Hsi-Yu; Chiueh, Tzihong; Broadhurst, Tom (2014). "Cosmic structure as the quantum interference of a coherent dark wave". Nature Physics. 10 (7): 496–499. arXiv:1406.6586. Bibcode:2014NatPh..10..496S. doi:10.1038/nphys2996. S2CID 118725080.
^Bohua Li; Tanja Rindler-Daller; Paul R. Shapiro (2014). "Cosmological Constraints on Bose-Einstein-Condensed Scalar Field Dark Matter". Phys. Rev. D. 89 (8): 083536. arXiv:1310.6061. Bibcode:2014PhRvD..89h3536L. doi:10.1103/PhysRevD.89.083536. S2CID 118654592.
^Lee, Jae-Weon (2018). "Brief History of Ultra-light Scalar Dark Matter Models". EPJ Web of Conferences. 168: 06005. arXiv:1704.05057. Bibcode:2018EPJWC.16806005L. doi:10.1051/epjconf/201816806005. S2CID 54649264.
^Timmer, John (2023-04-21). "No WIMPS! Heavy particles don't explain gravitational lensing oddities". Ars Technica. Retrieved 2023-06-08.
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