Scalar field dark matter
In astrophysics and cosmology scalar field dark matter is a classical, minimally coupled, scalar field postulated to account for the inferred dark matter.[2]
Background
The universe may be accelerating, fueled perhaps by a cosmological constant or some
other field possessing long range 'repulsive' effects. A model must predict the correct form for
the large scale clustering spectrum,
Scalar field
The dark matter can be modeled as a scalar field using two fitted parameters, mass and
The occupation number of these particles is so huge that we can consider the wave nature of these particles in the classical description. To satisfy Pauli's exclusion principle the particle must be bosons especially spin zero (scalar) particles. hence these ultra-light dark matter would be more like a wave than a particle, and the galactic halos are giant systems of condensed bose liquid, possibly superfluid. The dark matter can be described as a Bose–Einstein condensate of the ultralight quanta of the field[10] and as boson stars.[9] The enormous Compton wavelength of these particles prevents structure formation on small, subgalactic scales, which is a major problem in traditional cold dark matter models. The collapse of initial over-densities is studied in the references.[11][12][13][14] There are not many models in which we consider dark matter as the scalar field. Axion-like particle (ALP) in string theory can be considered as a model of scalar field dark matter, as its mass density satisfies the relic density of the dark matter. The most common production mechanism of ALP is misalignment mechanism. Which shows the mass around satisfies with the relic abundance of observed dark matter.[15]
This dark matter model is also known as BEC dark matter or wave dark matter. Fuzzy dark matter and ultra-light axion are examples of scalar field dark matter.
See also
- Weakly interacting massive particles– Hypothetical particles that may constitute dark matter
- Minimal Supersymmetric Standard Model – Simplest supersymmetric extension to the Standard Model
- Neutralino – Neutral mass eigenstate formed from superpartners of gauge and Higgs bosons
- Axion – Hypothetical elementary particle
- Dark matter halo – Theoretical cosmological structure
- Light dark matter – Dark matter weakly interacting massive particles candidates with masses less than 1 GeV
- Hot dark matter – Theoretical form of dark matter particles which travel near the speed of light
- Warm dark matter – Hypothesized form of dark matter
- Fuzzy cold dark matter – Hypothetical form of cold dark matter proposed to solve the cuspy halo problem
References
- ^ Jeremiah P. Ostriker and Paul Steinhardt New Light on Dark Matter
- ISBN 978-1-59454-248-0.
- ^ Galaxies are not scattered about the universe in a random way, but rather form an intricate network of filaments, sheets, and clusters. How these large-scale structures formed is at the root of many key questions in cosmology.
- .
- PMID 9901751.
- S2CID 44042014.
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- S2CID 119480411.
- ^ S2CID 16914311.
- S2CID 119415858.
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