(Self-)Magnetized Bose-Einstein Condensate stars

Abstract

We study magnetic field effects on the Equations of State (EoS) and the structure of Bose-Einstein Condensate (BEC) stars, i.e. a compact object composed by a gas of interacting spin one bosons formed up by the pairing of two neutrons. To include the magnetic field in the thermodynamic description, we suppose that particle-magnetic field and particle-particle interactions are independent. We consider two configurations for the magnetic field: one where it constant and externally fixed, and another where it is produced by the bosons by self-magnetization. Since the magnetic field produces the splitting of pressures in the directions along and perpendicular to the magnetic axis, stable configurations of self-magnetized and magnetized BEC stars are studied using the recently found $\gamma$-structure equations that describe axially symmetric objects. The magnetized BEC stars are, in general spheroidal, less massive and smaller than the non-magnetic ones, being these effects more relevant at low densities. For the self-magnetized BEC stars their inner profiles of magnetic field can be computed as a function of the equatorial radii. The values obtained for the core and surface magnetic fields are in agreement with those typical of compact objects.

15 pages, 20 figures, 1 table

References in corpus (10)

• Neutron Star Observations: Prognosis for Equation of State Constraints
• Equation of State of a Dense and Magnetized Fermion System
• Consistent neutron star models with magnetic field dependent equations of state
• Models of rotating boson stars and geodesics around them: new type of orbits
• Magnetized strange quark matter and magnetized strange quark stars
• BCS-BEC crossover of neutron pairs in symmetric and asymmetric nuclear matter
• (In-)Significance of the Anomalous Magnetic Moment of Charged Fermions for the Equation of State of a Magnetized and Dense Medium
• Boson star at finite temperature
• A theory of finite-temperature Bose-Einstein condensates in neutron stars
• Thermodynamical properties of a neutral vector boson gas in a constant magnetic field

Cited by in corpus (6)

• Observables of spheroidal magnetized Strange Stars
• Magnetostatic boson stars
• Modeling anisotropic magnetized strange quark stars
• Magnetized vector boson gas at any temperature
• Magnetized BEC stars with boundary conditions depending on magnetic field
• Constraints on Bose-Einstein condensate stars as neutron stars models from new observational data