Silhouettes of invisible black holes

Dokuchaev, V. I.; Nazarova, Natal'ya O.

doi:10.3367/ufnr.2020.01.038717

Cited by 36 publications

(16 citation statements)

References 325 publications

(181 reference statements)

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“…Since the deformation of the shadow depends on the spin of the black hole, measuring the parameters of this deformation may allow one to determine the spin of the black hole. This idea is discussed with different analytical and numerical techniques, e.g., in [36,41,46,89,92,96,[99][100][101][102][103][104][105][106].…”

Section: Analytical Properties Of the Shadow Of A Kerr Black Holementioning

confidence: 99%

Calculating black hole shadows: Review of analytical studies

Perlick,

Tsupko

2021

Preprint

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Example 2: Shadow in Reissner-Nordström space-time 9 Example 3: Shadow in Kottler space-time for static observer 9 IV. Shadow of a Kerr black hole 9 A. Calculation of the shadow for arbitrary position of the observer 9 B. Calculation of the shadow for an observer at large distance 13 C. Analytical properties of the shadow of a Kerr black hole 15 V. Generalization of the results for the Kerr space-time to other rotating black holes 17 VI. Shadows of wormholes and other compact objects that are not black holes 19 VII. The shadow of a collapsing star 21 VIII. Shadow in an expanding universe 21 A. Shadow in the Kottler space-time for comoving observers 22

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Section: Analytical Properties Of the Shadow Of A Kerr Black Holementioning

confidence: 99%

Calculating black hole shadows: Review of analytical studies

Perlick,

Tsupko

2021

Preprint

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“…See e.g. [15] for a recent review on BH shadows. Very long baseline interferometry (VLBI) surveys, wherein signals from various astronomical radio sources are collected at multiple radio telescopes on Earth, effectively emulating a single huge telescope with size given by the maximum separation between the individual telescopes, are expected to be able to detect the shadows of SMBHs [16].…”

Section: Introductionmentioning

confidence: 99%

Magnetically charged black holes from non-linear electrodynamics and the Event Horizon Telescope

Allahyari

Khodadi

Vagnozzi

et al. 2020

J. Cosmol. Astropart. Phys.

258

122

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Non-linear electrodynamics (NLED) theories are well-motivated extensions of QED in the strong field regime, and have long been studied in the search for regular black hole (BH) solutions. We consider two well-studied and well-motivated NLED models coupled to General Relativity: the Euler-Heisenberg model and the Bronnikov model. After carefully accounting for the effective geometry induced by the NLED corrections, we determine the shadows of BHs within these two models. We then compare these to the shadow of the supermassive BH M87* recently imaged by the Event Horizon Telescope collaboration. In doing so, we are able to extract upper limits on the black hole magnetic charge, thus providing novel constraints on fundamental physics from this new extraordinary probe.

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“…Formation of shadows and relativistic images of stationary black holes is closely related to photon regions [2,3], which are defined as compact domains where photons can travel endlessly without escaping to infinity or disappearing at the event horizon. Indeed, the boundary of the gravitational shadow corresponds to the set of light rays that inspiral asymptotically onto the part of the spherical surfaces in photon regions on which closed spherical photon orbits are located [4][5][6].…”

Section: Introductionmentioning

confidence: 99%