Galactic cold dark matter as a Bose-Einstein condensate of WISPs

Abstract

We propose here the dark matter content of galaxies as a cold bosonic fluid composed of Weakly Interacting Slim Particles (WISPs), represented by spin-0 axion-like particles and spin-1 hidden bosons, thermalized in the Bose-Einstein condensation state and bounded by their self-gravitational potential. We analyze two zero-momentum configurations: the polar phases in which spin alignment of two neighbouring particles is anti-parallel and the ferromagnetic phases in which every particle spin is aligned in the same direction. Using the mean field approximation we derive the Gross-Pitaevskii equations for both cases, and, supposing the dark matter to be a polytropic fluid, we describe the particles density profile as Thomas-Fermi distributions characterized by the halo radii and in terms of the scattering lengths and mass of each particle. By comparing this model with data obtained from 42 spiral galaxies and 19 Low Surface Brightness (LSB) galaxies, we constrain the dark matter particle mass to the range $10^{-6}-10^{-4}eV$ and we find the lower bound for the scattering length to be of the order $10^{-14}fm$.

13 pages; 6 figures; references added; v.3: typo corrected in the abstract, published in JCAP

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• A predictive model of BEC dark matter halos with a solitonic core and an isothermal atmosphere
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• Dwarf spheroidal galaxies as degenerate gas of free fermions
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• Jeans instability and turbulent gravitational collapse of Bose-Einstein Condensate dark matter halos
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• Thin accretion disks around cold Bose-Einstein Condensate stars
• Constraining condensate dark matter in galaxy clusters
• Gravitationally bound BCS state as dark matter
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• Bayesian analysis for rotational curves with $\ell$-boson stars as a dark matter component
• Dark stars in Starobinsky's model
• Discussion on the energy content of the galactic dark matter Bose-Einstein condensate halo in the Thomas-Fermi approximation
• Tidal deformability and radial oscillations of anisotropic polytropic spheres
• Quantum tunneling rate of dilute axion stars close to the maximum mass
• Bose-Einstein Condensate dark matter models in the presence of baryonic matter and random confining potentials
• Condensation of Galactic Cold Dark Matter
• On exotic objects made of dark energy and dark matter: Mass-to-radius profiles and tidal Love numbers
• Bose-Einstein Condensate Dark Matter Halos confronted with galactic rotation curves
• Domain Wall Model in the Galactic Bose-Einstein Condensate Halo