Gravitational lensing in rotating and twisting universes

Gürtuğ, Özay; Mangut, Mert; Halilsoy, Mustafa

doi:10.1016/j.astropartphys.2021.102558

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…One can obtain the following null geodesic equation [87] through the standard change of variable process, u = 1 r (recall the classical Kepler problems), and subsequently derive the evolution of the light curve in the SRBBH spacetime (21):…”

Section: Gravitational Lensing Of Srbbh Via Rimmentioning

confidence: 99%

“…We analyzed the gravitational lensing phenomenon for stars whose masses, radii, and rotational parameters are recorded in Reference [87], for specific values of the parameter, by utilizing the graphs presented in Figure 2. The analysis of the plots depicted in Figure 2 for various real stars observed in the cosmos demonstrates a clear correlation between the bumblebee parameter and the bending angle at low b Rstar values.…”

Section: Gravitational Lensing Of Srbbh Via Rimmentioning

confidence: 99%

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Probing the Lorentz Invariance Violation via Gravitational Lensing and Analytical Eigenmodes of Perturbed Slowly Rotating Bumblebee Black Holes

et al. 2023

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The ability of bumblebee gravity models to explain dark energy, which is the phenomenon responsible for the universe’s observed accelerated expansion, is one of their most significant applications. An effect that causes faster expansion can be linked to how much the Lorentz symmetry of our universe is violated. Moreover, since we do not know what generates dark energy, the bumblebee gravity theory seems highly plausible. By utilizing the physical changes happening around a rotating bumblebee black hole (RBBH), we aim to obtain more specific details about the bumblebee black hole’s spacetime and our universe. However, as researched in the literature, slow-spinning RBBH (SRBBH) spacetime, which has a higher accuracy, will be considered instead of general RBBH. To this end, we first employ the Rindler–Ishak method (RIM), which enables us to study how light is bent in the vicinity of a gravitational lens. We evaluate the deflection angle of null geodesics in the equatorial plane of the SRBBH spacetime. Then, we use astrophysical data to see the effect of the Lorentz symmetry breaking (LSB) parameter on the bending angle of light for numerous astrophysical stars and black holes. We also acquire the analytical greybody factors (GFs) and quasinormal modes (QNMs) of the SRBBH. Finally, we visualize and discuss the results obtained in the conclusion section.

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Section: Gravitational Lensing Of Srbbh Via Rimmentioning

confidence: 99%

Section: Gravitational Lensing Of Srbbh Via Rimmentioning

confidence: 99%

Probing the Lorentz Invariance Violation via Gravitational Lensing and Analytical Eigenmodes of Perturbed Slowly Rotating Bumblebee Black Holes

et al. 2023

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“…Their method is now very frequently used in analyzing gravitational lensing for geometries with non-asymptotic flatness. Moreover, this method is further generalized in [33] for rotating space-times. Let us now give a brief summary of the generalization made for geometries with rotation.…”

Section: Review Of Generalized Rindler and Ishak Formalism For Findin...mentioning

confidence: 99%

“…Following [28], other researchers have conducted important studies on GL that are related with rotating and twisting universes, nonlinear electrodynamics, galactic halo, monopoles etc. by using their method (see for example [30][31][32][33][34][35][36]). The most important feature of this study is that rotation of the spacetime will be considered together with the cosmological constant and GL will be calculated for different compact stars.…”

Section: Introductionmentioning

confidence: 99%

Gravitational Lensing in Kerr-Newman Anti de Sitter Spacetime

Mangut¹,

Gürsel²,

Сакалли³

2021

Preprint

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In this paper we study the effects of the cosmological constant and rotation on the deflection angle of null geodesics in the equatorial plane of Kerr-Newman anti de Sitter (KNAdS) spacetime.To this end, we employ the extension of Rindler-Ishak method to compute the gravitational lensing effect. Gravitational lensing phenomena based on diffraction of light have been studied for some stars and black holes, which are assumed to fit the KNAdS geometry. The results obtained are essential and important for studies in cosmology.

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