Comparing Bondi and Novikov–Thorne accretion disk luminosity around regular black holes
Capozziello S. Gambino S. Luongo O.
May 2025Elsevier B.V.
Physics of the Dark Universe
2025#48
We consider and compare the Bondi and Novikov–Thorne accretion mechanisms in spherically symmetric regular black holes. To do so, we model the dark matter distribution adopting two main approaches. The first takes into account a cosmologically-inspired dark fluid, whose pressure turns out to be constant, whereas the density and equation of state depend on the radial coordinate. The second case employs an exponential dark matter energy distribution that describes the dark matter cloud in the accretion process. Accordingly, we quantify the mass accreted by regular solutions with the above information on the energy–momentum tensor and their luminosity and thermal properties, derived from the background models. Numerical simulations of the accretion processes are then reported, comparing regular black holes with Schwarzschild and Schwarzschild–de Sitter metrics. In so doing, we consider the Hayward, Bardeen, Dymnikova and Fan–Wang solutions, where the addiction of a further parameter determines regularity. Implications and physical consequences of using the Novikov–Thorne and Bondi accretion backgrounds are thus critically discussed in varying the free parameters of each spacetime.
Black holes , Bondi accretion , Dark fluid , Novikov–Thorne accretion , Sofue density profile
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Dipartimento di Fisica “E. Pancini”, Università di Napoli “Federico II”, Via Cinthia, Napoli, Italy
Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Napoli, Napoli, Italy
Scuola Superiore Meridionale (SSM), Largo San Marcellino 10, Napoli, 80138, Italy
Research Center of Astrophysics and Cosmology, Khazar University, 41 Mehseti Street, Baku, AZ1096, Azerbaijan
School of Science and Technology, University of Camerino, Via Madonna delle Carceri, Camerino, 62032, Italy
Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Perugia, Perugia, 06123, Italy
INAF - Osservatorio Astronomico di Brera, Milano, Italy
Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
Dipartimento di Fisica “E. Pancini”
Istituto Nazionale di Fisica Nucleare (INFN)
Scuola Superiore Meridionale (SSM)
Research Center of Astrophysics and Cosmology
School of Science and Technology
Istituto Nazionale di Fisica Nucleare (INFN)
INAF - Osservatorio Astronomico di Brera
Al-Farabi Kazakh National University
10 лет помогаем публиковать статьи Международный издатель
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