Comparing thin accretion disk properties of naked singularities and black holes

Abstract

In the present paper, we study the thermal properties of the geometrically thin accretion disks surrounding the null naked singularity (NNS) and the first type of Joshi-Malafarina-Narayan (JMN1) spacetimes and compare the results with the accretion disk around equally massive Schwarzschild black hole. First, we examine the properties of the circular orbits in these spacetimes. The emitted flux, radiation spectra, disk efficiency, and temperature distribution on the disk surface are then investigated. The efficiency of the conversion of the accreting matter into radiation is found to be substantially higher for naked singularities than that for black holes. We also verify that the flux radiated from the disk surface is greater for null and JMN1 naked singularities than black holes. Hence, the accretion disks around naked singularities are much more luminous than the black holes of the same mass and accretion rate. In the luminosity spectra of the NNS, we find that the significant contribution of the low-frequency is coming from the nearby regions of the NNS. Furthermore, the spectral luminosity distribution for the "non-zero torque" at the inner boundary is also analysed by the inclusion of the non-zero torque value at the inner edge of the disk. The slopes of the luminosity distribution with respect to frequency for naked singularity spacetimes differ significantly from those of black holes. These unique features of the naked singularities serve as an effective tool to distinguish them from the equally massive black holes.

arXiv comment16 pages, 20 figures

References in corpus (50)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
• First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• First M87 Event Horizon Telescope Results. II. Array and Instrumentation
• First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
• Hunting for extra dimensions in the shadow of M87*
• Naked Singularities in Spherically Symmetric Inhomogeneous Tolman-Bondi Dust Cloud Collapse
• Shadows of spherically symmetric black holes and naked singularities
• Can the supermassive objects at the centers of galaxies be traversable wormholes? The first test of strong gravity for mm/sub-mm VLBI facilities
• Recent developments in gravitational collapse and spacetime singularities
• Thin accretion disks in stationary axisymmetric wormhole spacetimes
• Wormhole Shadows
• Black hole shadow in a general rotating spacetime obtained through Newman-Janis algorithm
• Influence of global cosmological expansion on local dynamics and kinematics
• Distinguishing black holes from naked singularities through their accretion disk properties
• Equilibrium configurations from gravitational collapse
• Electromagnetic signatures of thin accretion disks in wormhole geometries
• Circular geodesics and accretion disks in Janis-Newman-Winicour and Gamma metric
• Can accretion disk properties observationally distinguish black holes from naked singularities?
• Can accretion disk properties distinguish gravastars from black holes?
• Physical Processes in Naked Singularity Formation
• Image of the Janis-Newman-Winicour naked singularity with a thin accretion disk
• Can we distinguish black holes from naked singularities by the images of their accretion disks?
• Shadow of a Naked Singularity without Photon Sphere
• Thin Accretion Disk around a four-dimensional Einstein-Gauss-Bonnet Black Hole
• The final fate of spherical inhomogeneous dust collapse II: Initial data and causal structure of singularity
• Gravitational collapse with non-vanishing tangential stresses II: a laboratory for cosmic censorship experiments
• Timelike geodesics in Naked Singularity and Black Hole Spacetimes
• Thin accretion disk in the Simpson-Visser black-bounce and wormhole spacetimes
• New solutions of Einstein equations in spherical symmetry: the Cosmic Censor to the court
• Shadow of nulllike and timelike naked singularities without photon spheres
• Thin Accretion Disk onto slowly rotating black holes in Einstein-Æther theory
• Strong curvature naked singularities in spherically symmetric perfect fluid collapse
• Gravitational collapse of an isentropic perfect fluid with a linear equation of state
• Nakedness and curvature strength of shell-focusing singularity in the spherically symmetric space-time with vanishing radial pressure
• Strong gravitational lensing by a strongly naked null singularity
• Towards an observational test of black hole versus naked singularity at the galactic center
• Perihelion Precession and Shadows near Blackholes and Naked Singularities
• Thin accretion disks around traversable wormholes
• Initial data and spherical dust collapse
• Genericity aspects in gravitational collapse to black holes and naked singularities
• Global visibility of a strong curvature singularity in nonmarginally bound dust collapse
• A simple derivation of the naked singularity in spherical dust collapse
• Astrophysics of Bertrand Space-times
• Globally visible singularity in an astrophysical setup
• Causal Structure of Singularity in non-spherical Gravitational Collapse
• Accretion disks around naked singularities
• Galactic Dark Matter and Bertrand Space-times

Cited by in corpus (2)

• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• Light trajectory and shadow shape in the rotating naked singularity