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Gravitational lensing by transparent Janis–Newman–Winicour naked singularities
The Janis–Newman–Winicour (JNW) spacetime can describe a naked singularity with a photon sphere that smoothly transforms into a Schwarzschild black...
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Shadows and precession of orbits in rotating Janis–Newman–Winicour spacetime
In this paper, we construct the rotating Janis–Newman–Winicour (JNW) naked singularity spacetime using Newman–Janis Algorithm (NJA). We analyse NJA...
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Exact rotating black hole solutions for f(R) gravity by modified Newman Janis algorithm
We show that the f ( R )-gravity theories with constant Ricci scalar in the Jordan/Einstein frame can be described by Einstein or Einstein–Maxwell...
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Spinning black holes with a separable Hamilton–Jacobi equation from a modified Newman–Janis algorithm
Obtaining solutions of the Einstein field equations describing spinning compact bodies is typically challenging. The Newman–Janis algorithm provides...
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Classical observables using exponentiated spin factors: electromagnetic scattering
In [1], the authors argued that the Newman-Janis algorithm on the space of classical solutions in general relativity and electromagnetism could be...
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Black hole shadow of a rotating polytropic black hole by the Newman–Janis algorithm without complexification
In this work, starting from a spherically symmetric polytropic black hole, a rotating solution is obtained by following the Newman–Janis algorithm...
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Amplitudes from Coulomb to Kerr-Taub-NUT
Electric-magnetic duality, the Newman-Janis shift, and the double copy all act by elementary operations on three-point amplitudes. At the same time,...
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Light trajectory and shadow shape in the rotating naked singularity
In this paper, we investigate the light trajectories and shadow properties in the rotating version of null naked singularity (NNS) spacetime which is...
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Optical features of rotating black hole with nonlinear electrodynamics
In this article, we considered the strong field approximation of nonlinear electrodynamics black hole and constructed its rotating counterpart by...
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Black hole surrounded by the pseudo-isothermal dark matter halo
In this paper, we obtain a new spherically symmetric black hole surrounded by the pseudo-isothermal dark matter halo. Furthermore, to explore the...
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A worldsheet for Kerr
We show that the Newman-Janis shift property of the exact Kerr solution can be interpreted in terms of a worldsheet effective action. This holds both...
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Deflection angle and shadow of slowly rotating black holes in galactic nuclei
In this paper, we construct the slowly rotating case of an asymptotically flat supermassive black hole embedded in dark matter using Newman–Janis...
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Regularizing the JNW and JMN naked singularities
We extend the method of Simpson and Visser (SV) of regularizing a black hole spacetime, to cases where the initial metric represents a globally naked...
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Optical behaviors of black holes in Starobinsky–Bel–Robinson gravity
Inspired by M-theory scenarios, we investigate optical properties of black holes in the Starobinsky–Bel–Robinsion gravity. Precisely, we study the...
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Modeling the black holes surrounded by a dark matter halo in the galactic center of M87
In this paper, the structure of a dark matter halo can be well described by the mass model of M87 and the Einasto profile for the cold dark matter...
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Finite-distance gravitational deflection of massive particles by a rotating black hole in loop quantum gravity
A rotating black hole in loop quantum gravity was constructed by Brahma, Chen, and Yeom based on a nonrotating counterpart using the revised...
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Regular Rotating Black Holes and Solitons with the de Sitter/Phantom Interiors
We overview the basic characteristic features of the regular rotating black holes (RRBHs) and physical solitons G-lumps, which are nonsingular...
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Regular Rotating Black Holes
The collapse of astrophysically significant bodies generates, under suitable conditions, black holes. Since one expects the generator of the black...
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Shadows of rotating quintessential black holes in Einstein–Gauss–Bonnet gravity with a cloud of strings
Using the Newman–Janis algorithm, we study certain optical behaviors of rotating quintessential black holes in Einstein Gauss–Bonnet gravity models...
