Equation of State for Neutralino Star as a Form of Cold Dark Matter

Abstract

In order to study the structure of neutralino star and dark galaxy, we consider dynamical interactions due to boson-exchange in the neutralino matter. Taking into account interactions of neutralinos with bosons, we derive the equation of state (EOS) of neutralino stars in terms of the relativistic mean field approach. Then we apply the resulting EOS to investigate properties of the neutralino star such as its density profile and mass limit. For example, if the neutralino mass is around 1 TeV, the Oppenheimer mass limit of the neutralino star is obtained as $6.06\times 10^{-7}{M}_{\odot }$, and the corresponding radius is about 7.8 mm. Actually, due to an increasing annihilation rate as indicated by our calculation, this dense state can never be realized in practice. Our results also show that the low density neutralino star may be a possible aggregation of the cold dark matter.

5 pages, 5 figures; v2: matches published version

References in corpus (21)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Supersymmetric Dark Matter
• Relativistic Equation of State of Nuclear Matter for Supernova and Neutron Star
• DarkSUSY: Computing Supersymmetric Dark Matter Properties Numerically
• Relativistic Equation of State of Nuclear Matter for Supernova Explosion
• Axion Miniclusters and Bose Stars
• Non-Linear Axion Dynamics and Formation of Cosmological Pseudo-Solitons
• Small-scale clumps in the galactic halo and dark matter annihilation
• Spherical Scalar Field Halo in Galaxies
• Neutralino annihilation into gamma-rays in the Milky Way and in external galaxies
• TeV gamma-rays and the largest masses and annihilation cross sections of neutralino dark matter
• Limits on direct detection of neutralino dark matter from b -> s gamma decays
• Gamma Rays from Heavy Neutralino Dark Matter
• Numerical studies of Phi^2-Oscillatons
• Complete relativistic equation of state for neutron stars
• Possible Indications of a Clumpy Dark Matter Halo
• Stars and Halos of Degenerate Relativistic Heavy-Neutrino and Neutralino Matter
• Scalar field "mini--MACHOs": a new explanation for galactic dark matter
• Gamma Radiation by Neutralino Stars
• Gamma rays from dark matter annihilation in the Draco and observability at ARGO

Cited by in corpus (4)

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• Can the dark matter halo be a collisionless ensemble of axion stars?
• Neutralino dark matter stars can not exist