Total light bending in non-asymptotically flat black hole spacetimes

Autor:	Sánchez, Flavio C., Roque, Armando A., Rodríguez, Benito, Chagoya, Javier
Rok vydání:	2023
Předmět:	General Relativity and Quantum Cosmology Astrophysics - Astrophysics of Galaxies Physics - Optics
Zdroj:	Class. Quantum Grav. (2024) 41 015019
Druh dokumentu:	Working Paper
DOI:	10.1088/1361-6382/ad0e81
Popis:	The gravitational deflection of light is a critical test of modified theories of gravity. A few years ago, Gibbons and Werner introduced a definition of the deflection angle based on the Gauss-Bonnet theorem. In more recent years, Arakida proposed a related idea for defining the deflection angle in non-asymptotically flat spacetimes. We revisit this idea and use it to compute the angular difference in the Kottler geometry and a non-asymptotically flat solution in Horndeski gravity. Our analytic and numerical calculations show that a triangular array of laser beams can be designed so that the proposed definition of the deflection angle is sensitive to different sources of curvature. Moreover, we find that near the photon sphere, the deflection angle in the Horndeski solution is similar to its Schwarzschild counterpart, and we confirm that the shadows seen by a static observer are identical. Comment: 32+1 pages, 6 figures, 2 tables
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2306.12488 Zobrazit plný text záznamu View this record from Arxiv