Gravomagnetic lensing by NUT space

Nouri-Zonoz, M.; Lynden-Bell, D.

doi:10.1093/mnras/292.3.714

Cited by 51 publications

(44 citation statements)

References 8 publications

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“…However, if they do exist, they could be detected by way of their lensing features, as shown by Nouri-Zonoz and Lynden-Bell [9], and also by way of their influence on orbiting matter, as shown in this paper.…”

Section: Discussionmentioning

confidence: 52%

“…As for all astrophysical objects, in principle there are two such means: One could observe the influence on light (i.e., the lensing features) or the influence on massive particles. The lensing features of NUT objects have been comprehensively discussed by Nouri-Zonoz and Lynden-Bell [9]; an analytical formula for the shadow of a NUT black hole, which is a particular lensing feature, is contained as a special case in the work of Grenzebach et al [10]. The motion of massive particles in the NUT space-time was studied in a mathematically very elaborate paper by Kagramanova et al [11]; moreover, Hackmann and Lämmerzahl [12] calculated an upper bound for the NUT charge of the Sun by analysing the motion of Mercury.…”

Section: Introductionmentioning

confidence: 99%

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Circular motion in NUT space-time

Jefremov

Perlick

2016

Class. Quantum Grav.

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Abstract. We consider circular motion in the NUT (Newman-Unti-Tamburino) space-time. Among other things, we determine the location of circular time-like geodesic orbits, in particular of the innermost stable circular orbit (ISCO) and of the marginally bound circular orbit. Moreover, we discuss the von Zeipel cylinders with respect to the stationary observers and with respect to the Zero Angular Momentum Observers (ZAMOs). We also investigate the relation of von Zeipel cylinders to inertial forces, in particular in the ultra-relativistic limit. Finally, we generalise the construction of thick accretion tori ("Polish doughnuts") which are well known on the Schwarzschild or Kerr background to the case of the NUT metric. We argue that, in principle, a NUT source could be distinguished from a Schwarzschild or Kerr source by observing the features of circular matter flows in its neighbourhood.

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Section: Discussionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Circular motion in NUT space-time

Jefremov

Perlick

2016

Class. Quantum Grav.

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“…This results in the vanishing of the global angular momentum. Also, if one compares the gravitational lensing produced by the Schwarzschild and Taub-NUT metrics, the effects are the same except for a shearing effect coming from the NUT parameter [30]. It is interesting to note that the Plebański-Demiański metric cannot be written in the Kerr-Schild form [25] unless the acceleration and NUT parameters vanish [34].…”

Section: Introductionmentioning

confidence: 99%

Topological characterization of higher-dimensional charged Taub–NUT instantons

Flores-Alfonso

Quevedo

2019

Int. J. Geom. Methods Mod. Phys.

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Topological excitations of gauge fields exhibit a discrete behavior, which arises from the global structure. We calculate the Chern numbers of higher dimensional Taub-NUT and Taub-Bolt instantons and find the winding numbers, which classify the U(1)−bundles that harbor Maxwell dyons. Our results can be written in general for any even dimension and apply for many different theories of gravity. We illustrate this point by focusing on Lovelock gravity. The magnetic flux is found to be a pure topological excitation whereas the electric flux is indirectly indexed by the magnetic counterpart. We argue that this last result is a consequence of the path integral approach to quantum gravity.MSC: 32L81, 51P05, 55R15, 58J28, 81T70

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“…The gravitomagnetic lensing in nonrotating NUT spacetime has been studied in [60]. The results show that the NUT charge influences the gravitational lensing through the null geodesics.…”

Section: Introductionmentioning

confidence: 99%

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

Wei¹,

Liu²,

Fu³

et al. 2012

J. Cosmol. Astropart. Phys.

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In this paper, we investigate the strong gravitational lensing by the stationary, axially-symmetric black hole in Kerr-Taub-NUT spacetime in the strong field limit. The deflection angle of light ray and other strong deflection limit coefficients are obtained numerically and they are found to be closely dependent on the NUT charge n and spin a. The magnification and the positions of the relativistic images are computed. The caustics are studied and the results show that these caustics drift away from the optical axis, which is quite different from the Schwarzschild black hole case. Moreover, the intersections of the critical curves on the equatorial plane are obtained and it is shown that they increase with the NUT charge. These results show that there is a significant effect of the NUT charge on the strong gravitational lensing.

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Gravomagnetic lensing by NUT space

Cited by 51 publications

References 8 publications

Circular motion in NUT space-time

Circular motion in NUT space-time

Topological characterization of higher-dimensional charged Taub–NUT instantons

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

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