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Fuzzy Dark Matter (FDM) has recently emerged as an interesting alternative model to the standard Cold Dark Matter (CDM). In this model, dark matter consists of very light bosonic particles with quantum mechanical effects on galactic scales.…

Cosmology and Nongalactic Astrophysics · Physics 2023-11-08 Sana Elgamal , Matteo Nori , Andrea V. Macciò , Marco Baldi , Stefan Waterval

Fuzzy dark matter (FDM) is a dark matter candidate consisting of ultra-light scalar particles with masses around $10^{-22} \mathrm{eV}/c^2$, a regime where cold bosonic matter behaves as a collective wave rather than individual particles.…

Cosmology and Nongalactic Astrophysics · Physics 2023-07-19 Simon May , Volker Springel

Fuzzy dark matter (FDM) made of ultra-light bosonic particles is a viable alternative to cold dark matter (CDM) with clearly distinguishable small-scale features in collapsed structures. On large scales, it behaves gravitationally like CDM…

Cosmology and Nongalactic Astrophysics · Physics 2022-05-11 Bodo Schwabe , Jens C. Niemeyer

We study cosmological structure formation with ultralight axion dark matter, or "fuzzy dark matter (FDM), using a particle-mesh scheme to account for the quantum pressure arising in the Madelung formulation of the Schr\"odinger-Poisson…

Cosmology and Nongalactic Astrophysics · Physics 2017-01-03 Jan Veltmaat , Jens C. Niemeyer

Fuzzy dark matter (FDM), composed of ultralight bosons, exhibits intricate wave phenomena on galactic scales. Compared to cold dark matter, FDM simulations are significantly more computationally demanding due to the need to resolve the de…

Cosmology and Nongalactic Astrophysics · Physics 2026-04-07 Hsi-Yu Schive

Gravitational weak lensing by dark matter halos leads to a measurable imprint in the shear correlation function of galaxies. Fuzzy dark matter (FDM), composed of ultralight axion-like particles of mass $m\sim 10^{-22}\text{ eV}$, suppresses…

Cosmology and Nongalactic Astrophysics · Physics 2022-08-29 Mona Dentler , David J. E. Marsh , Renée Hložek , Alex Laguë , Keir K. Rogers , Daniel Grin

An ultra-light bosonic particle of mass around $10^{-22}\,\mathrm{eV}/c^2$ is of special interest as a dark matter candidate, as it both has particle physics motivations, and may give rise to notable differences in the structures on highly…

Cosmology and Nongalactic Astrophysics · Physics 2024-06-18 Simon May , Volker Springel

Fuzzy dark matter (FDM) or wave dark matter is an alternative theory designed to solve the small-scale problems faced by the standard cold dark matter proposal for the primary material component of the universe. It is made up of ultra-light…

Cosmology and Nongalactic Astrophysics · Physics 2021-12-08 Mihir Kulkarni , Jeremiah P. Ostriker

The fuzzy dark matter (FDM) scenario has received increased attention in recent years due to the small-scale challenges of the vanilla Lambda cold dark matter ($\Lambda$CDM) cosmological model and the lack of any experimental evidence for…

Cosmology and Nongalactic Astrophysics · Physics 2023-01-20 Tibor Dome , Anastasia Fialkov , Philip Mocz , Björn Malte Schäfer , Michael Boylan-Kolchin , Mark Vogelsberger

Fuzzy Dark Matter (FDM), motivated by string theory, has recently become a hot candidate for dark matter. The rest mass of FDM is believed to be $\sim 10^{-22}$eV and the corresponding de-Broglie wave length is $\sim 1$kpc. Therefore, the…

Cosmology and Nongalactic Astrophysics · Physics 2019-01-08 Jiajun Zhang , Hantao Liu , Ming-Chung Chu

Dark matter may be composed of ultra-light bosons whose de Broglie wavelength in galaxies is of order 1 kpc. The standard model for this fuzzy dark matter (FDM) is a complex scalar field that obeys the Schr\"odinger-Poisson equations. The…

Cosmology and Nongalactic Astrophysics · Physics 2023-11-23 Boris Zupancic , Lawrence M. Widrow

Fuzzy dark matter (FDM), a scalar particle coupled to the gravitational field without self-interaction whose mass range is $m \sim 10^{-24} - 10^{-20}\ \rm{eV}$, is one of the promising alternative dark matter candidates to cold dark…

Cosmology and Nongalactic Astrophysics · Physics 2022-02-02 Hiroki Kawai , Masamune Oguri , Alfred Amruth , Tom Broadhurst , Jeremy Lim

Fuzzy Dark Matter (FDM) represents an alternative and intriguing description of the standard Cold Dark Matter (CDM) fluid, able to explain the lack of direct detection of dark matter particles in the GeV sector and to alleviate small scales…

Cosmology and Nongalactic Astrophysics · Physics 2018-11-30 Matteo Nori , Riccardo Murgia , Vid Iršič , Marco Baldi , Matteo Viel

Fuzzy dark matter (FDM) is a promising candidate for dark matter, characterized by its ultra-light mass, which gives rise to wave effects at astrophysical scales. These effects offer potential solutions to the small-scale issues encountered…

Cosmology and Nongalactic Astrophysics · Physics 2024-07-30 Hamed Manouchehri Kousha , Mohammad Ansarifard , Aliakbar Abolhasani

An intriguing alternative to cold dark matter (CDM) is that the dark matter is a light ( $m \sim 10^{-22}$ eV) boson having a de Broglie wavelength $\lambda \sim 1$ kpc, often called fuzzy dark matter (FDM). We describe the arguments from…

Cosmology and Nongalactic Astrophysics · Physics 2017-03-08 Lam Hui , Jeremiah P. Ostriker , Scott Tremaine , Edward Witten

One of the challenging questions in cosmology is the nature of dark matter particles. Fuzzy Dark Matter (FDM) is one of the candidates which is made of very light ($m_{FDM}\simeq 10^{-22}-10^{-21}$ eV) bosonic particles with no…

Cosmology and Nongalactic Astrophysics · Physics 2020-01-22 Alireza Maleki , Shant Baghram , Sohrab Rahvar

Fuzzy Dark Matter (FDM) has recently gained attention as a motivated candidate for the dark matter (DM) content of the Universe, as opposed to the commonly assumed cold DM (CDM), since the soliton profile intrinsic to FDM models was found…

Cosmology and Nongalactic Astrophysics · Physics 2024-08-01 Tatyana Shevchuk , Ely D. Kovetz , Adi Zitrin

Fuzzy (wave) dark matter (FDM), the dynamical model underlying an ultralight bosonic dark matter species, produces a rich set of non-gravitational signatures that distinguishes it markedly from the phenomenologically related warm (particle)…

Cosmology and Nongalactic Astrophysics · Physics 2025-04-22 Tim Zimmermann , David J. E. Marsh , Keir K. Rogers , Hans A. Winther , Sijing Shen

In the fuzzy dark matter (FDM) model, dark matter is composed of ultra-light particles with a de Broglie wavelength of $\sim$kpc, above which it behaves like cold dark matter (CDM). Due to this, FDM suppresses the growth of structure on…

Cosmology and Nongalactic Astrophysics · Physics 2022-06-01 Debanjan Sarkar , Jordan Flitter , Ely D. Kovetz

The distinctive effects of fuzzy dark matter are most visible at non-linear galactic scales. We present the first simulations of mixed fuzzy and cold dark matter, obtained with an extended version of the Nyx code. Fuzzy (or ultralight, or…

Cosmology and Nongalactic Astrophysics · Physics 2020-10-21 Bodo Schwabe , Mateja Gosenca , Christoph Behrens , Jens C. Niemeyer , Richard Easther
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