Fuzzy cold dark matter explained

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

≈ 10-22

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]

Notes

  1. Cold and Fuzzy Dark Matter. 10.1103/PhysRevLett.85.1158. 2000. Physical Review Letters. 85. 6. 1158–61. 10991501. astro-ph/0003365. Hu. Wayne. Barkana. Rennan. Gruzinov. Andrei. 2000PhRvL..85.1158H . 118938504 .
  2. Schive. Hsi-Yu. Chiueh. Tzihong. Broadhurst. Tom. Cosmic structure as the quantum interference of a coherent dark wave. Nature Physics. 10. 496–499. 2014. 7. 10.1038/nphys2996. 1406.6586. 2014NatPh..10..496S. 118725080.
  3. Mocz. Philip. Fialkov. Anastasia. Vogelsberger. Mark. Becerra. Fernando. Amin. Mustafa A.. Bose. Sownak. Boylan-Kolchin. Michael. Chavanis. Pierre-Henri. Hernquist. Lars. Lancaster. Lachlan. Marinacci. Federico. Robles. Victor H.. Zavala. Jesús. First Star-Forming Structures in Fuzzy Cosmic Filaments. Physical Review Letters. 123. 14. 141301. 2019. 0031-9007. 10.1103/PhysRevLett.123.141301. 31702225. 1910.01653. 2019PhRvL.123n1301M. 203734641.
  4. Bohua Li . Tanja Rindler-Daller . Paul R. Shapiro . Cosmological Constraints on Bose-Einstein-Condensed Scalar Field Dark Matter. Phys. Rev. D. 89 . 8 . 083536 . 10.1103/PhysRevD.89.083536. 1310.6061 . 2014PhRvD..89h3536L . 2014 . 118654592 .
  5. Lee. Jae-Weon. 2018. Brief History of Ultra-light Scalar Dark Matter Models. EPJ Web of Conferences. 168. 06005. 2018EPJWC.16806005L. 1704.05057. 10.1051/epjconf/201816806005. 54649264.
  6. Web site: Timmer . John . No WIMPS! Heavy particles don't explain gravitational lensing oddities . Ars Technica . 2023-04-21 . 2023-06-08.

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