Results 31 to 40 of about 621,294 (188)
Higher order corrections to deflection angle of massive particles and light rays in plasma media for stationary spacetimes using the Gauss-Bonnet theorem [PDF]
Physical Review D, 2019 The purpose of this article is twofold. First, we extend the results presented in [Gabriel Crisnejo and Emanuel Gallo, Phys.Rev.D 97, 124016 (2018)] to stationary spacetimes.
Gabriel Crisnejo, E. Gallo, K. Jusufi
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Application of the Gauss–Bonnet theorem to lensing in the NUT metric [PDF]
General Relativity and Gravitation, 2020 We show with the help of Fermat’s principle that every lightlike geodesic in the NUT metric projects to a geodesic of a two-dimensional Riemannian metric which we call the optical metric. The optical metric is defined on a (coordinate) cone whose opening
Mourad Halla, V. Perlick
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Diving inside a hairy black hole
Journal of High Energy Physics, 2021 We investigate the interior of the Einstein-Gauss-Bonnet charged black-hole with scalar hair. We find a variety of dynamical epochs, with the particular important feature that the Cauchy horizon is not present.
Nicolás Grandi, Ignacio Salazar Landea
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Weak deflection angle by Casimir wormhole using Gauss-Bonnet theorem and its shadow [PDF]
Modern Physics Letters A, 2020 In this paper, we calculate the weak deflection angle by Casimir wormhole and its shadow. To do so, we derive the Gaussian optical curvature and use the Gauss–Bonnet theorem (GBT).
W. Javed, A. Hamza, A. Övgün
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Mathematics, 2021 A method of the Riemann–Hilbert problem is employed for Zhang’s conjecture 2 proposed in Philo. Mag. 87 (2007) 5309 for a ferromagnetic three-dimensional (3D) Ising model in a zero external magnetic field.
Zhidong Zhang, Osamu Suzuki
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International Journal of Geometric Methods in Modern Physics (IJGMMP), 2022 In this paper, we study the gravitational lensing by some black hole classes within the nonlinear electrodynamics in weak field limits. First, we calculate an optical geometry of the nonlinear electrodynamics black hole and then we use the Gauss–Bonnet ...
H. El moumni, K. Masmar, A. Övgün
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Charged stars in 4D Einstein–Gauss–Bonnet gravity
European Physical Journal C: Particles and Fields, 2021 An alternative gravity theory that has attracted considerable attention recently is the novel four-dimensional Einstein–Gauss–Bonnet (4EGB) gravity. This idea was proposed to bypass the Lovelock’s theorem and to permit nontrivial higher curvature effects
Ayan Banerjee +2 more
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Light deflection and Gauss–Bonnet theorem: definition of total deflection angle and its applications [PDF]
, 2017 In this paper, we re-examine the light deflection in the Schwarzschild and the Schwarzschild–de Sitter spacetime. First, supposing a static and spherically symmetric spacetime, we propose the definition of the total deflection angle $$\alpha $$α of the ...
H. Arakida
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Riemann-Finsler surfaces [PDF]
, 2007 This paper study the Gauss-Bonnet theorem for Finsler surfaces with smooth boundary. This is a natural generalization of the Gauss-Bonnet theorem for Riemannian surfaces with smooth boundary as well as an extension of the Gauss-Bonnet theorem for ...
Sabau, Sorin V, Shimada, Hideo
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Weak deflection angle by asymptotically flat black holes in Horndeski theory using Gauss–Bonnet theorem [PDF]
, 2021 The principal objective of this project is to investigate the gravitational lensing by asymptotically flat black holes in the framework of Horndeski theory in weak field limits.
W. Javed +3 more
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