Accretion disk luminosity around rotating naked singularities
Kurmanov Y. Boshkayev K. Konysbayev T. Muccino M. Luongo O. Urazalina A. Dalelkhankyzy A. Belissarova F. Alimkulova M.
May 2025Elsevier B.V.
Physics of the Dark Universe
2025#48
We explore circular geodesics of neutral test particles in the gravitational field of a rotating deformed mass. The geometry around this source is described by the Quevedo–Mashhoon solution, which corresponds to a naked singularity. To this end, we compute the orbital parameters of test particles in the equatorial plane, such as the angular velocity Ω, energy E and angular momentum L, per unit mass. We also numerically estimate the radius of the innermost stable circular orbit rISCO. In addition, we consider a simple model for the disks radiative flux, differential luminosity, and spectral luminosity, employing the well-known Novikov–Page–Thorne model. We mainly focus on the flux of the accretion disk around several rotating naked singularities possessing the same mass and quadrupole moment but different rotation and deformation parameters. We analyze the possibility of distinguishing Kerr black holes from rotating naked singularities. The astrophysical implications of the results obtained are discussed.
Accretion disk , Differential luminosity , Naked singularities , Radiative flux , Spectral luminosity
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National Nanotechnology Laboratory of Open Type, Almaty, 050040, Kazakhstan
Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
Institute of Nuclear Physics, Ibragimova, 1, Almaty, 050032, Kazakhstan
Università di Camerino, Divisione di Fisica, Via Madonna delle carceri 9, Camerino, 62032, Italy
ICRANet, Piazza della Repubblica 10, Pescara, 65122, Italy
SUNY Polytechnic Institute, Utica, 13502, NY, United States
INAF, Osservatorio Astronomico di Brera, Milano, Italy
INFN, Sezione di Perugia, Perugia, 06123, Italy
Kazakh National Womens Teacher Training University, Ayteke Bi, 99, Almaty, 050040, Kazakhstan
National Nanotechnology Laboratory of Open Type
Al-Farabi Kazakh National University
Institute of Nuclear Physics
Università di Camerino
ICRANet
SUNY Polytechnic Institute
INAF
INFN
Kazakh National Womens Teacher Training University
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