Accretion disk luminosity around rotating naked singularities

被引：0
作者：
Kurmanov, Yergali [1 ,2 ]
Boshkayev, Kuantay [1 ,2 ,3 ]
Konysbayev, Talgar [1 ,2 ]
Muccino, Marco [2 ,4 ,5 ]
Luongo, Orlando [2 ,4 ,6 ,7 ,8 ]
Urazalina, Ainur [1 ,2 ,3 ]
Dalelkhankyzy, Anar [9 ]
Belissarova, Farida [2 ]
Alimkulova, Madina [2 ]
机构：
[1] Natl Nanotechnol Lab Open Type, Alma Ata 050040, Kazakhstan
[2] AL Farabi Kazakh Natl Univ, Almaty Ave 71, Alma Ata 050040, Kazakhstan
[3] Inst Nucl Phys, Alma Ata 050032, Kazakhstan
[4] Univ Camerino, Div Fis, Via Madonna Carceri 9, I-62032 Camerino, Italy
[5] ICRANet, Piazza Repubbl 10, I-65122 Pescara, Italy
[6] SUNY Polytech Inst, Utica, NY 13502 USA
[7] INAF, Osservatorio Astron Brera, Milan, Italy
[8] INFN, Sez Perugia, I-06123 Perugia, Italy
[9] Kazakh Natl Womens Teacher Training Univ, Ayteke Bi 99, Alma Ata 050000, Kazakhstan
来源：
PHYSICS OF THE DARK UNIVERSE | 2025年 / 48卷
关键词：
Accretion disk; Radiative flux; Differential luminosity; Spectral luminosity; Naked singularities; REGULAR BLACK-HOLE; MULTIPOLE MOMENTS; GRAVITATIONAL-FIELD; GENERAL-RELATIVITY; MASS; EQUATIONS; VARIABILITY; COLLAPSE; KERR;
D O I：
10.1016/j.dark.2025.101917
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 Q, energy E and angular momentum L, per unit mass. We also numerically estimate the radius of the innermost stable circular orbit rrsco. In addition, we consider a simple model for the disk's 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.
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页数：11
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