Black hole tidal charge constrained by strong gravitational lensing

Horváth, Zsolt; Gergely, L.

doi:10.1002/asna.201211992

Cited by 19 publications

(14 citation statements)

References 30 publications

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“…Influence of the braneworld tidal charge b on the motion of test particles and related physical phenomena in vicinity of compact objects has been extensively investigated for both the black holes [11][12][13][14][15][16][17][18][19] and neutron stars [20][21][22][23][24][25], or in the weak field limit [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

String loops in the field of braneworld spherically symmetric black holes and naked singularities

Stuchlík

Kološ

2012

J. Cosmol. Astropart. Phys.

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We study motion of current-carrying string loops in the field of braneworld spherically symmetric black holes and naked singularities. The spacetime is described by the Reissner-Nordström geometry with tidal charge b reflecting the non-local tidal effects coming from the external dimension; both positive and negative values of the spacetime parameter b are considered. We restrict attention to the axisymmetric motion of string loops when the motion can be fully governed by an appropriately defined effective potential related to the energy and angular momentum of the string loops. In dependence on these two constants of the motion, the string loops can be captured, trapped, or can escape to infinity. In close vicinity of stable equilibrium points at the centre of trapped states the motion is regular. We describe how it is transformed to chaotic motion with growing energy of the string loop. In the field of naked singularities the trapped states located off the equatorial plane of the system exist and trajectories unable to cross the equatorial plane occur, contrary to the trajectories in the field of black holes where crossing the equatorial plane is always admitted. We concentrate our attention to the so called transmutation effect when the string loops are accelerated in the deep gravitational field near the black hole or naked singularity by transforming the oscillatory energy to the energy of the transitional motion. We demonstrate that the influence of the tidal charge can be substantial especially in the naked singularity spacetimes with b > 1 where the acceleration to ultrarelativistic velocities with Lorentz factor γ ∼ 100 can be reached, being more than one order higher in comparison with those obtained in the black hole spacetimes.

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Section: Introductionmentioning

confidence: 99%

String loops in the field of braneworld spherically symmetric black holes and naked singularities

Stuchlík

Kološ

2012

J. Cosmol. Astropart. Phys.

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“…The effects of the charged Horndeski black hole with respect to their corresponding values of the Schwarzschild black hole in GR can also be indicated by [75,76,145,149], refs. [80,90,109,150,151] and ref. [112].…”

Section: Strong Deflection Limit and Observablesmentioning

confidence: 99%

Weak and strong deflection gravitational lensings by a charged Horndeski black hole

Chen¹,

Shen²,

Xie

2019

J. Cosmol. Astropart. Phys.

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A charged black hole was predicted by the Einstein-Horndeski-Maxwell theory.In order to provide its observational signatures, we investigate its weak and strong deflection gravitational lensings. We find its weak deflection lensing observables, including the positions, magnifications and differential time delay of the lensed images. We also obtain its strong deflection lensing observables, including the apparent radius of the photon sphere as well as the angular separation, brightness difference and differential time delay between the relativistic images. Taking the supermassive black hole in the Galactic Center as the lens, we evaluate these observables and compare these signatures with those of the Schwarzschild, Reissner-Nordström, tidal Reissner-Nordström and charged Galileon black holes. After a detailed analysis of the feasibility of measuring these lensing observables, we conclude that although it is possible to detect some leading effects of the weak and strong deflection lensings by the charged Horndeski and other black holes with current technology, it would be unlikely to distinguish one kind of these black holes from the others based on these detections in the near future due to lack of enough highly angular resolution in astronomical observations to tell their differences.

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“…This result, as I pointed out, is obtained from a rotating black hole. On the other hand, constraints on the tidal charge have been reported using, in general, metrics with spherical geometry, especially a Reissner-Nordström-type geometry (with a tidal charge instead of a Coulomb charge [45][46][47][48][49]) that appears in brane contexts as it was reported in Ref. [39].…”

Section: Introductionmentioning

confidence: 99%

Constraining the tidal charge of brane black holes using their shadows

Neves

2020

Eur. Phys. J. C

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A constraint on the tidal charge generated within a brane world is shown. Using the shadow of a rotating black hole in a brane context in order to describe the M87* parameters recently announced by the Event Horizon Telescope Collaboration, the deviation from circularity of the reported shadow produces an upper bound on the bulk’s nonlocal effect, which is conceived of as a tidal charge in the four-dimensional brane induced by the five-dimensional bulk. Therefore, a deviation from circularity $$\lesssim 10\%$$≲10% leads to an upper bound on the tidal charge $$\lesssim 0.004M^2$$≲0.004M2.

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Black hole tidal charge constrained by strong gravitational lensing

Cited by 19 publications

References 30 publications

String loops in the field of braneworld spherically symmetric black holes and naked singularities

String loops in the field of braneworld spherically symmetric black holes and naked singularities

Weak and strong deflection gravitational lensings by a charged Horndeski black hole

Constraining the tidal charge of brane black holes using their shadows

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