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.Comment: 21 pages, 12 figures, accepted for publication in EPJC; reference
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