Weak Deflection Angle and Greybody Bound of Magnetized Regular Black Hole

Javed, Wajiha; Riaz, Sibgha; Овгун, Али

doi:10.3390/universe8050262

Cited by 13 publications

(2 citation statements)

References 42 publications

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“…In another work, the weak deflection angle by black holes and wormholes has been extensively studied with different examples and wormhole structures [60]. Apart from these, there are several studies dealing with deflection angle in the domain of black holes and wormholes [61][62][63][64][65]. Traversable wormholes in extended teleparallel gravity with matter coupling is studied in ref.…”

Section: Introductionmentioning

confidence: 99%

Tideless traversable wormholes surrounded by cloud of strings in f(R) gravity

Gogoi

Goswami

2023

J. Cosmol. Astropart. Phys.

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We study the tideless traversable wormholes in the f(R) gravity metric formalism. First we consider three shape functions of wormholes and study their viabilities and structures. The connection between the f(R) gravity model and wormhole shape function has been studied and the dependency of the f(R) gravity model with the shape function is shown. We also obtain a wormhole solution in the f(R) gravity Starobinsky model surrounded by a cloud of strings. In this case, the wormhole shape function depends on both the Starobinsky model parameter and the cloud of strings parameter. The structure and height of the wormhole is highly affected by the cloud of strings parameter, while it is less sensitive to the Starobinsky model parameter. The energy conditions have been studied and we found the ranges of the null energy condition violation for all wormhole structures. The quasinormal modes from these wormhole structures for the scalar and Dirac perturbations are studied using higher order WKB approximation methods. The quasinormal modes for the toy shape functions depend highly on the model parameters. In case of the Starobinsky model's wormhole the quasinormal frequencies and the damping rate increase with an increase in the Starobinsky model parameter in scalar perturbation. Whereas in Dirac perturbation, with an increase in the Starobinsky model parameter the quasinormal frequencies decrease and the damping rate increases. The cloud of strings parameter also impacts prominently and differently the quasinormal modes from the wormhole in the Starobinsky model.

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Section: Introductionmentioning

confidence: 99%

Tideless traversable wormholes surrounded by cloud of strings in f(R) gravity

Gogoi

Goswami

2023

J. Cosmol. Astropart. Phys.

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“…Sanchez showed that the absorption spectrum as a function of the frequency makes clear oscillations characteristic of a diffraction pattern, where the oscillations occur around the constant value of the geometrical optics with decreasing amplitude and constant period. The absorption cross-section for black holes have been studied in literature for a various black hole spacetimes [46,104,[129][130][131][132][133][134][135][136][137][138][139][140], especially for the low-frequency behavior of the absorption and for the zero-frequency limit (it becomes equal to surface area of the black hole horizon) [130,141,142], as well as the high-frequency behavior of the scalar absorption via Sinc approximation [128,143,144].…”

Section: Introductionmentioning

confidence: 99%

Shadow, lensing and neutrino propagation by dyonic ModMax black holes

Pantig¹,

Mastrototaro²,

Lambiase³

et al. 2022

Preprint

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Motivated by recent work on the Modified Maxwell (ModMax) black holes [Phys. Lett.B 10.1016Lett.B 10. /j.physletb.2020, which are invariant in duality rotations and conformal transformations founded in [ Phys.Rev.D 10.1103/PhysRevD.102.121703], we probe its effects on the shadow cast, weak field gravitational lensing, and neutrino propagation in its vicinity. Using the EHT data for the shadow diameter of Sgr. A* and M87*, and LIGO/VIRGO experiments for the dyonic ModMax black hole perturbations, we find constraints for ModMax parameters such as Qm and the screening factor γ. We also analyze how the shadow radius behaves as perceived by a static observer and one that is comoving with the cosmic expansion. The effect of the ModMax parameters is constant for a static observer, and we found That it varies when the observer is comoving with cosmic expansion. We also analyzed its effect on the weak deflection angle by exploiting the Gauss-Bonnet theorem and its application to Einstein ring formation. We also consider the finite distance effect and massive particle deflection. Our results indicate that the far approximation of massive particle gives the largest deflection angle and amplifies the effect of Qm and γ. With the advent of improving space technology, we reported that it is possible to detect the deviation caused through the shadow cast, Einstein rings, quasinormal modes, and neutrino oscillations.

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Regular Charged Black Holes, Energy Conditions, and Quasinormal Modes

Balart,

Panotopoulos,

Rincón

2023

Fortschritte der Physik

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Energy conditions and quasinormal modes (QNMs) for scalar perturbations of regular charged black holes within the framework of General Relativity coupled to non‐linear electrodynamics (NLE) are discussed. The frequencies are computed numerically adopting the WKB method, while in the eikonal limit an analytic expression for the spectra is obtained. The impact of the electric charge, the angular degree, and the overtone number on the spectra is investigated in detail. All frequencies are characterized by a negative imaginary part, and that each type of energy conditions imply a different quasinormal spectrum are found.

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Weak Deflection Angle and Greybody Bound of Magnetized Regular Black Hole

Cited by 13 publications

References 42 publications

Tideless traversable wormholes surrounded by cloud of strings in f(R) gravity

Tideless traversable wormholes surrounded by cloud of strings in f(R) gravity

Shadow, lensing and neutrino propagation by dyonic ModMax black holes

Regular Charged Black Holes, Energy Conditions, and Quasinormal Modes

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