Strong field limit analysis of gravitational lensing in Kerr-Taub-NUT spacetime

Wei, Shao-Wen; Liu, Yu-Xiao; Fu, Chu-Li; Yang, Ke

doi:10.1088/1475-7516/2012/10/053

Cited by 73 publications

(37 citation statements)

References 76 publications

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“…The subject of gravitational lensing beyond weak deflection approximation becomes very popular, because in the strong field regime it is possible to differ and compare different theories of gravity, see, for example, Refs. [57,3,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78]. Nevertheless, there are no big chances so far to observe the high-order images.…”

Section: Black Hole Lensingmentioning

confidence: 99%

Gravitational Lensing in Presence of Plasma: Strong Lens Systems, Black Hole Lensing and Shadow

2017

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Abstract:In this article, we present an overview of the new developments in problems of the plasma influence on the effects of gravitational lensing, complemented by pieces of new material and relevant discussions. Deflection of light in the presence of gravity and plasma is determined by a complex combination of various physical phenomena: gravity, dispersion, refraction. In particular, the gravitational deflection itself, in a homogeneous plasma without refraction, differs from the vacuum one and depends on the frequency of the photon. In an inhomogeneous plasma, chromatic refraction also takes place. We describe chromatic effects in strong lens systems including a shift of angular position of image and a change in magnification. We also investigate high-order images that arise when lensing on a black hole surrounded by homogeneous plasma. The recent results of analytical studies of the effect of plasma on the shadow of the Schwarzschild and Kerr black holes are presented.

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Section: Black Hole Lensingmentioning

confidence: 99%

Gravitational Lensing in Presence of Plasma: Strong Lens Systems, Black Hole Lensing and Shadow

2017

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“…Recently, black holes with NUT charge have attracted some interesting researches, such as gravitational lensing [40], thermodynamics and phase transition [41][42][43][44][45][46], strong cosmic censorship conjecture [47] and weak cosmic censorship conjecture [48]. In this paper, we investigate the validity of the weak cosmic censorship conjecture for Kerr-Taub-NUT black holes by considering scattering of a test massive scalar field and injection of a test particle, respectively.…”

Section: Introductionmentioning

confidence: 99%

Weak cosmic censorship conjecture for a Kerr-Taub-NUT black hole with a test scalar field and particle

et al. 2020

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Motivated by the recent researches of black holes with NUT charge, we investigate the validity of the weak cosmic censorship conjecture for Kerr-Taub-NUT black hole with a test massive scalar field and a test particle, respectively. For the scalar field scattering gedanken experiment, we consider an infinitesimal time interval process. The result shows that both extremal and near-extremal Kerr-Taub-NUT black holes cannot be over-spun. For the test particle thought experiment, the study suggests that extremal Kerr-Taub-NUT black hole cannot be over-spun; while near-extremal Kerr-Taub-NUT black hole can be over-spun. By comparing the two methods, the results indicate the time interval for particles crossing the black hole horizon might be important for consideration of the weak cosmic censorship conjecture.

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“…Relativistic images in vacuum in different types of metric and alternative theories of gravitation have been extensively studied in [3,4,[12][13][14][15][16][17][18][19][20][21]. The existence of photon spheres plays an important role in gravitational lensing [6,22,23].…”

Section: Introductionmentioning

confidence: 99%

Gravitational lensing in plasma: Relativistic images at homogeneous plasma

Tsupko

Бисноватый-Коган

2013

Phys. Rev. D

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We investigate the influence of plasma presence on relativistic images formed by Schwarzschild black hole lensing. When a gravitating body is surrounded by a plasma, the lensing angle depends on a frequency of the electromagnetic wave due to refraction properties, and the dispersion properties of the light propagation in gravitational field in plasma. The last effect leads to a difference, even in uniform plasma, of the gravitational deflection angle in plasma from the vacuum case. This angle depends on the photon frequency, which resembles the properties of the refractive prism spectrometer. Here we consider the case of a strong deflection angle for the light, traveling near the Schwarzschild black hole, surrounded by a uniform plasma. Asymptotic formulas are obtained for the case of a very large deflection angle, exceeding 2. We apply these formulas for calculation of position and magnification of relativistic images in a homogeneous plasma, which are formed by the photons performing one or several revolutions around the central object. We conclude that the presence of the uniform plasma increases the angular size of relativistic rings or the angular separation of point images from the gravitating center. The presence of the uniform plasma increases also a magnification of relativistic images. The angular separation and the magnification become significantly larger than in the vacuum case, when the photon frequency goes to a plasma frequency.

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Strong field limit analysis of gravitational lensing in Kerr-Taub-NUT spacetime

Cited by 73 publications

References 76 publications

Gravitational Lensing in Presence of Plasma: Strong Lens Systems, Black Hole Lensing and Shadow

Gravitational Lensing in Presence of Plasma: Strong Lens Systems, Black Hole Lensing and Shadow

Weak cosmic censorship conjecture for a Kerr-Taub-NUT black hole with a test scalar field and particle

Gravitational lensing in plasma: Relativistic images at homogeneous plasma

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