Cold and Fuzzy Dark Matter

By Wayne Hu, R. Barkana, A. Gruzinov. 2000

559 citations recorded by the source corpus.

Cold dark matter (CDM) models predict small-scale structure in excess of observations of the cores and abundance of dwarf galaxies. These problems might be solved, and the virtues of CDM models retained, even without postulating ad hoc dark matter particle or field interactions, if the dark matter is composed of ultra-light scalar particles ( m ∼ 10 − 22 eV), initially in a (cold) Bose-Einstein condensate, similar to axion dark matter models. The wave properties of the dark matter stabilize gravitational collapse providing halo cores and sharply suppressing small-scale linear power.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6ca3bfb4b3b43b69f171a3b277ded448317e4330

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Florian Kuhnel
2. Jeremiah P. Ostriker
3. B. Carr
4. S. Tremaine
5. Tongyan Lin
6. Kiwoon Choi
7. Sang Hui Im
8. C. Shin

In Nuclear and High Energy Physics

1. Florian Kuhnel
2. B. Carr
3. Tongyan Lin
4. P. Graham
5. S. Rajendran
6. J. Mardon
7. Yue Zhao
8. Kiwoon Choi

Citations in the corpus

• Dark matter models and direct detection (2019, background): “The regime within an order of magnitude or so of 10−22 eV is known as Fuzzy DM [17, 18].”
• Ultralight scalars as cosmological dark matter (2016, background): “[12] W. Hu, R. Barkana, and A. Gruzinov, “Cold and fuzzy dark matter,” Phys.”
• Radio for hidden-photon dark matter detection (2014, background): “However, even though the fields can have a non-zero amplitude when mγ′ → 0, they cannot be a dominant component of the dark matter if their mass is below ∼10−22 eV, since their de-Broglie wavelength would be larger than the size of the galaxy [43].”
• Lectures on Dark Matter Physics (2016, background): “Ultra-light scalar DM particles near the bottom of this bound are referred to as ‘fuzzy’ dark matter [45].”
• Pulsar timing signal from ultralight scalar dark matter (2013, background): “This leads to a cutoff in the linear power spectrum of density perturbations at large wavenumbers [4].”
• Primordial black holes as dark matter candidates (2021, background): “Particles which are not produced through the mechanisms discussed above or which avoid annihilation include axion-like particles [253–255], sterile neutrinos [256,257], ultra-light or “fuzzy” dark matter [258,259].”
• Recent Progress in the Physics of Axions and Axion-Like Particles (2020, background): “Moreover, the wavelike property of axion DM suppresses the growth of density perturbation below a certain comoving Jeans scale [2, 99], affecting the gravitational lensing of CMB [100].”
• Cosmological Moduli and the Post-Inflationary Universe: A Critical Review (2015, background): “One important consideration is that scalar fields on small scales can cease to be homogeneous and this can introduce a gradient pressure that prevents collapse [143, 144].”
• Modified Gravity and Cosmology (2011, methodology): “This is the cusp problem [366] and proposed solutions within the CDM paradigm include self-interacting dark matter [1174], fuzzy dark matter [628], or various feedback processes that expel dark matter.”
• The Kreuzer-Skarke axiverse (2018, methodology): “Axions with m ∼ 10−22 eV could constitute a portion of the dark matter, and could give rise to small-scale structure in better agreement with observations than that predicted by cold dark matter models [24] (for recent work, see e.”