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The Scalar Field Dark Matter (SFDM) model, also called Fuzzy, Wave, Bose-Einstein, Ultra-light Dark Matter, has received a lot of attention because it has been able to provide simpler and more natural explanations for various features of…

Cosmology and Nongalactic Astrophysics · Physics 2022-11-28 Tonatiuh Matos

Axion-like particle (ALP) dark matter shows distinctive behavior on scales where wavelike effects dominate over self-gravity. Ultralight axions are candidates for fuzzy dark matter (FDM) whose de Broglie wavelength in virialized halos…

Cosmology and Nongalactic Astrophysics · Physics 2020-07-15 Jens C. Niemeyer

According to the Schr\"odinger-Poisson equations, fuzzy dark matter (FDM) can form a stable equilibrium configuration, the so-called FDM soliton. In principle, given the FDM particle mass, the profile of the FDM soliton is fixed. In…

High Energy Physics - Phenomenology · Physics 2025-08-29 Chen Tan , M. Le Delliou , Ke Wang

The axion-like particles with ultralight mass ($\sim10^{-22}$eV) can be a possible candidate of dark matter, known as the fuzzy dark matter (FDM). These particles form Bose-Einstein condensate in the early Universe which can explain the…

General Relativity and Quantum Cosmology · Physics 2022-01-14 Shreyansh S. Dave , Sanatan Digal

Fuzzy dark matter (FDM) is a proposed modification for the standard cold dark matter (CDM) model motivated by small-scale discrepancies in low-mass galaxies. Composed of ultra-light (mass $\sim 10^{-22}$ eV) axions with kpc-scale de Broglie…

Astrophysics of Galaxies · Physics 2022-12-21 Mihir Kulkarni , Eli Visbal , Greg L. Bryan , Xinyu Li

Fuzzy Dark Matter (FDM), consisting of ultralight bosons ($m_{\rm b} \sim 10^{-22}\ \rm eV$), is an intriguing alternative to Cold Dark Matter. Numerical simulations that solve the Schr\"odinger-Poisson (SP) equation show that FDM halos…

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

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

We present the first set of high-resolution, hydrodynamical cosmological simulations of galaxy formation in a Fuzzy Dark Matter (FDM) framework. These simulations were performed with a new version of the GASOLINE2 code, known as…

Astrophysics of Galaxies · Physics 2024-11-18 Matteo Nori , Shubhan Bhatia , Andrea V. Macciò

We use observations of ultra-faint dwarf (UFD) galaxies to constrain the particle mass of ultra-light dark matter. Potential fluctuations created by wave interference in virialized "fuzzy" dark matter (FDM) halos dynamically heat stellar…

Cosmology and Nongalactic Astrophysics · Physics 2022-03-22 Neal Dalal , Andrey Kravtsov

Fuzzy Dark Matter (FDM) is among the most suitable candidates to replace WIMPs and to resolve the puzzling mystery of dark matter. A galactic dark matter halo made of these ultralight bosonic particles leads to the formation of a solitonic…

Astrophysics of Galaxies · Physics 2025-03-19 Gabriel d'Andrade Furlanetto , Riccardo Della Monica , Ivan De Martino

Fuzzy dark matter (FDM), an attractive dark matter candidate comprising ultralight bosons (axions) with a particle mass $m_a\sim10^{-22}$ eV, is motivated by the small-scale challenges of cold dark matter and features a kpc-size de Broglie…

Astrophysics of Galaxies · Physics 2024-04-30 Hsun-Yeong Yang , Barry T. Chiang , Guan-Ming Su , Hsi-Yu Schive , Tzihong Chiueh , Jeremiah P. Ostriker

In fuzzy dark matter scenarios, the quantum wave nature of ultralight axion-like particles generates stochastic density fluctuations inside dark matter halos. These fluctuations, known as granules, perturb the orbits of subhalos and other…

Cosmology and Nongalactic Astrophysics · Physics 2025-08-27 Yu Zhao , Andrew Benson , Xiaolong Du

The fuzzy dark matter (FDM) model treats DM as a bosonic field with astrophysically large de Broglie wavelength. A striking feature of this model is $\mathcal{O}(1)$ fluctuations in the dark matter density on time scales which are shorter…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-07 David J. E. Marsh , Jens C. Niemeyer

Fuzzy Dark Matter (FDM) models admit self-similar solutions which are very different from their Cold Dark Matter (CDM) counterparts and do not converge to the latter in the semiclassical limit. In contrast with the familiar CDM hierarchical…

Cosmology and Nongalactic Astrophysics · Physics 2025-07-31 Raquel Galazo García , Philippe Brax , Patrick Valageas

The particle mass of dark matter (DM) was previously constrained using kinematics of ultra-faint dwarf galaxies to $m > 3 \times 10^{-19}\,\mathrm{eV}$. This constraint, which excludes the "fuzzy" range of ultra-light dark matter from…

Cosmology and Nongalactic Astrophysics · Physics 2025-09-08 Simon May , Neal Dalal , Andrey Kravtsov

We present a novel method to constrain the mass of ultra-light bosons as the dark matter using stellar streams formed by disrupting Globular Clusters in the Milky Way. The turbulent density field of Fuzzy Dark Matter (FDM) haloes results in…

Astrophysics of Galaxies · Physics 2018-08-03 Nicola C. Amorisco , A. Loeb

Potential small-scale discrepancies in the picture of galaxy formation painted by the $\Lambda$CDM paradigm have led to considerations of modified dark matter models. One such dark matter model that has recently attracted much attention is…

Cosmology and Nongalactic Astrophysics · Physics 2019-05-08 Olof Nebrin , Raghunath Ghara , Garrelt Mellema

A very light boson of mass $\mathcal{O}(10^{-22})$ eV may potentially be a viable dark matter (DM) candidate which can avoid phenomenological problems associated with cold DM. Such "fuzzy DM (FDM)" may naturally be an axion with a decay…

High Energy Physics - Phenomenology · Physics 2017-04-12 Hooman Davoudiasl , Christopher W. Murphy

We present an in-depth exploration of the phenomenon of dynamical friction in a universe where the dark matter is composed entirely of so-called Fuzzy Dark Matter (FDM), ultralight bosons of mass $m\sim\mathcal{O}(10^{-22})\,$eV. We review…

Cosmology and Nongalactic Astrophysics · Physics 2020-01-15 Lachlan Lancaster , Cara Giovanetti , Philip Mocz , Yonatan Kahn , Mariangela Lisanti , David N. Spergel