Astrophysics (Index)About

fuzzy dark matter

(FDM, fuzzy cold dark matter, scalar field dark matter, wave dark matter)
(concept of extremely light dark matter particles)

Fuzzy dark matter (FDM or fuzzy cold dark matter) is a model of dark matter presuming it consists of particles with rest mass on the order of 10-22eV. This quality gives it a very long Compton wavelength, on the order of a light-year, which means that in addition to interacting with each other and other matter via gravity, it would interact via quantum-mechanical effects at a considerable distance. A favored model, cold dark matter (CDM) has the problem that simulations produce too much small-scale variation, and FDM has the potential to match CDM's successes without suffering from this problem, i.e., it has a smoothing effect at just the scale to smooth out the small-scale variations seen in simulations.

The conceived mass is orders-of-magnitude below range of masses measured by experiment and current normal means of detecting masses, and far less than the estimates for established low-mass particles such as axions and neutrinos, which are thought to have masses greater than 10-5 eV. Studies have posited constraints on the masses that are possible based on various observations and the masses presumed by current FDM theories generally fall within a couple of orders of magnitude of 10-22 eV.

Dark matter particles with such a low mass would be more wave-like and would be best described by a quantum field theory (QFT). The terms wave dark matter and scalar field dark matter have also been used for the concept.

(astrophysics,dark matter,early universe,cosmology)
Further reading:

Referenced by pages:
axion (A0)
core-cusp problem
dark matter
dynamical friction
repulsive dark matter (RDM)
Schrödinger-Poisson equation