Distorted local shadows

Abdolrahimi, Shohreh; Mann, Robert B.; Tzounis, Christos

doi:10.1103/physrevd.91.084052

Cited by 44 publications

(34 citation statements)

References 49 publications

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“…4. Interestingly, multiple disconnected shadows of the (single) BH occur: the largest ones (besides the main "hammerlike" shadow) are two eyebrows [30,31], at symmetric positions above and below the main shadow, but we have detected many other smaller shadows, hinting again at a self-similar structure. On the third row of Fig.…”

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confidence: 76%

Shadows of Kerr Black Holes with Scalar Hair

et al. 2015

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Using backwards ray tracing, we study the shadows of Kerr black holes with scalar hair (KBHSH). KBHSH interpolate continuously between Kerr BHs and boson stars (BSs), so we start by investigating the lensing of light due to BSs. Moving from the weak to the strong gravity region, BSs-which by themselves have no shadows-are classified, according to the lensing produced, as (i) noncompact, which yield not multiple images, (ii) compact, which produce an increasing number of Einstein rings and multiple images of the whole celestial sphere, and (iii) ultracompact, which possess light rings, yielding an infinite number of images with (we conjecture) a self-similar structure. The shadows of KBHSH, for Kerr-like horizons and noncompact BS-like hair, are analogous to, but distinguishable from, those of comparable Kerr BHs. But for non-Kerr-like horizons and ultracompact BS-like hair, the shadows of KBHSH are drastically different: novel shapes arise, sizes are considerably smaller, and multiple shadows of a single BH become possible. Thus, KBHSH provide quantitatively and qualitatively new templates for ongoing (and future) very large baseline interferometry observations of BH shadows, such as those of the Event Horizon Telescope.

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confidence: 76%

Shadows of Kerr Black Holes with Scalar Hair

et al. 2015

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“…However, in our most general case here, we do not restrict the metric functions to be of the form given in Eq. (41).…”

Section: Separation Of Null Geodesic Equations and Black Hole Shmentioning

confidence: 99%

Black hole shadow in a general rotating spacetime obtained through Newman-Janis algorithm

2019

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The Newman-Janis (NJ) algorithm has been extensively used in the literature to generate rotating black hole solutions from nonrotating seed spacetimes. In this work, we show, using various constants of motion, that the null geodesic equations in an arbitrary stationary and axially symmetric rotating spacetime obtained through the NJ algorithm can be separated completely, provided that the algorithm is applied successfully without any inconsistency.Using the separated null geodesic equations, we then obtain an analytic general formula for obtaining the contour of a shadow cast by a compact object whose gravitational field is given by the arbitrary rotating spacetime under consideration. As special cases, we apply our general analytic formula to some known black holes and reproduce the corresponding results for black hole shadow. Finally, we consider a new example and study shadow using our analytic general formula. * rshaikh@iitk.ac.in

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“…Using the deformation of the shadow shape of an isolated black hole we can evaluate its spin and multipole moments [20][21][22][23]. On the other hand, we can detect the interaction of the black hole with an external gravitation field, since it leads to the formation of complicated lensing patterns with hierarchies of multiple shadow images [24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

On the shadow of rotating traversable wormholes

et al. 2018

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We revisit the shadow of rotating traversable wormholes discussing the role of the wormhole throat in the shadow formation. For certain classes of wormholes the throat serves as a potential barrier for light rays with particular impact parameters, thus modifying the shadow shape. We consider a couple of wormhole solutions and examine the structure of their shadow images, and the intrinsic mechanisms for their formation. Some of the shadows possess cuspy edges, which arise due to the interplay of two distinct families of unstable spherical orbits. These solutions provide examples, in which the explicit mechanism for cusp formation can be uncovered.

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Distorted local shadows

Cited by 44 publications

References 49 publications

Shadows of Kerr Black Holes with Scalar Hair

Shadows of Kerr Black Holes with Scalar Hair

Black hole shadow in a general rotating spacetime obtained through Newman-Janis algorithm

On the shadow of rotating traversable wormholes

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