Thin accretion disks around cold Bose-Einstein Condensate stars

Abstract

Due to their superfluid properties some compact astrophysical objects, like neutron or quark stars, may contain a significant part of their matter in the form of a Bose-Einstein Condensate. Observationally distinguishing between neutron/quark stars and Bose-Einstein Condensate stars is a major challenge for this latter theoretical model. An observational possibility of indirectly distinguishing Bose-Einstein Condensate stars from neutron/quark stars is through the study of the thin accretion disks around compact general relativistic objects. In the present paper, we perform a detailed comparative study of the electromagnetic and thermodynamic properties of the thin accretion disks around rapidly rotating Bose-Einstein Condensate stars, neutron stars and quark stars, respectively. Due to the differences in the exterior geometry, the thermodynamic and electromagnetic properties of the disks (energy flux, temperature distribution, equilibrium radiation spectrum and efficiency of energy conversion) are different for these classes of compact objects. Hence in this preliminary study we have pointed out some astrophysical signatures that may allow to observationally discriminate between Bose-Einstein Condensate stars and neutron/quark stars, respectively.

21 pages, 12 figures, accepted for publication in EPJC; reference added

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Cited by in corpus (8)

• Accretion disks around the Gibbons-Maeda-Garfinkle-Horowitz-Strominger charged black holes
• Testing Bose-Einstein Condensate dark matter models with the SPARC galactic rotation curves data
• Thin accretion disks and charged rotating dilaton black holes
• Static spherically symmetric three-form stars
• Compact stars admitting Finch-Skea symmetry in the presence of various matter fields
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• Compact stars in the Einstein dark energy model
• Black hole solutions in modified gravity induced by quantum metric fluctuations