https://doi.org/10.1140/epjc/s10052-015-3428-3
Regular Article - Theoretical Physics
Thin accretion disks around cold Bose–Einstein condensate stars
1
Department of Physics, Babes-Bolyai University, Kogalniceanu Street, Cluj-Napoca, Romania
2
Department of Mathematics, University College London, Gower Street, London, WC1E 6BT, UK
3
Max-Fiedler-Str. 7, 45128, Essen, Germany
* e-mail: t.harko@ucl.ac.uk
Received:
19
March
2015
Accepted:
22
April
2015
Published online:
9
May
2015
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 (BEC). Observationally distinguishing between neutron/quark stars and BEC stars is a major challenge for this latter theoretical model. An observational possibility of indirectly distinguishing BEC 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 BEC 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 one to observationally discriminate between BEC stars and neutron/quark stars.
© SIF and Springer-Verlag Berlin Heidelberg, 2015
