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Image of the Janis-Newman-Winicour naked singularity with a thin accretion disk

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arxiv 1905.05273 v1 pith:MHAMZESW submitted 2019-05-13 gr-qc astro-ph.HE

Galin Gyulchev , Petya Nedkova , Tsvetan Vetsov , Stoytcho Yazadjiev This is my paper · ORCID
classification gr-qcastro-ph.HE
keywords diskradiationaccretionfluxjanis-newman-winicourappearancenakedsingularity
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We study the optical appearance and the apparent radiation flux of a thin accretion disk around the static Janis-Newman-Winicour naked singularity. We confine ourselves to the astrophysically most relevant case, when the solution possesses a photon sphere, assuming that the radiation emitted by the disk is described by the Novikov-Thorne model. The observable images resemble closely the visual appearance of the Schwarzschild black hole, as only quantitative differences are present. For the Janis-Newman-Winicour solution the accretion disk appears smaller, and its emission is characterized by a higher peak of the radiation flux. In addition, the most significant part of the radiation is concentrated in a closer neighbourhood of the flux maximum. The results are obtained independently by two alternative methods, consisting of a semi-analytical scheme using the spherical symmetry of the spacetime, and a fully numerical ray-tracing procedure valid for any stationary and axisymmetric spacetime.

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Cited by 3 Pith papers

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  1. Viscosity effects on the shadow of a non-rotating black hole

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  2. Optimal Control Theory of the (2+1)-Dimensional BTZ Black Hole

    gr-qc 2025-12 conditional novelty 5.0 of 10

    Geodesics of the Weinhold and Ruppeiner thermodynamic metrics are computed for the BTZ black hole and interpreted as optimal evaporation/accretion protocols.

  3. Image of the time-dependent black hole

    gr-qc 2025-07 conditional novelty 4.0 of 10

    For a Vaidya black hole with linearly growing mass, the accretion disk image's bright spot shifts radially outward with the conformal time coordinate, while the observed flux in the conformal frame remains time-independent.

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