Is dark matter a scalar field?
The dark matter can be modeled as a scalar field using two fitted parameters, mass and self-interaction.
Is dark matter fermionic or bosonic?
There is generally a preference for boson dark matter over fermion dark matter, but the difference Δχ2 is not statistically significant for individual galaxies, except for UGC11914, see Figure 8.
What is scalar field in cosmology?
Scalar Field Cosmology — Geometry of Dynamics We study the Scalar Field Cosmology (SFC) using the geometric language of the phase space. We define and study an ensemble of dynamical systems as a Banach space with a Sobolev metric. The metric in the ensemble is used to measure a distance between different models.
Can dark matter be a Bose Einstein condensate?
Hence dark matter can be described as a non-relativistic, Newtonian Bose-Einstein gravitational condensate gas, whose density and pressure are related by a barotropic equation of state.
Is dark matter self interacting?
One such model is called self-interacting dark matter, and like the name suggests it predicts that dark matter does occasionally interact with itself, meaning that dark matter particles can sometimes bounce off each other or even annihilate each other.
Is dark matter a wave?
We review the physics and phenomenology of wave dark matter: a bosonic dark matter candidate lighter than about 30 eV. Such particles have a de Broglie wavelength exceeding the average inter-particle separation in a galaxy like the Milky Way, and are well described as classical waves.
Is dark matter a fermion?
There are many particle candidates for dark matter, which can be considered in two general categories: particles (mainly fermions) that contribute individually to the matter density of the Universe, and bosons that contribute collectively in the form of coherent waves.
What is dark matter and antimatter?
Antimatter is also produced by lightning and cosmic rays. It is well understood by physicists, and is predicted by standard particle physics theories. Dark matter is matter that does not interact electromagnetically, and therefore cannot be seen using light.
What is the cold dark matter theory?
In cosmology and physics, cold dark matter (CDM) is a hypothetical type of dark matter. Observations indicate that approximately 27% of the universe is dark matter, and 68% is dark energy, with only a small fraction being the ordinary baryonic matter that composes stars, planets, and living organisms.
What is the cusp core problem?
The cuspy halo problem (also known as the core-cusp problem) refers to a discrepancy between the inferred dark matter density profiles of low-mass galaxies and the density profiles predicted by cosmological N-body simulations.