Light deflection by a rotating global monopole spacetime
Kimet JusufiPhysics Department, State University of Tetovo, Ilinden Street nn, 1200 Tetovo, MacedoniaMarcus C. WernerYukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, JapanAyan BanerjeeDepartment of Mathematics, Jadavpur University, Kolkata 700 032, West Bengal, IndiaAli ÖvgünInstituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4950, Valparaíso, Chile
2017en
ABI
Abstract
We investigate the deflection of light by a rotating global monopole spacetime and a rotating Letelier spacetime in the weak deflection approximation. To this end, we apply the Gauss-Bonnet theorem to the corresponding osculating optical geometries and show that the deflection of light increases in each spacetime due to the presence of the global monopole parameter and the string cloud parameter, respectively. The results obtained for the deflection angle in the equatorial plane generalize known results for the corresponding nonrotating global monopole and Letelier spacetimes as well as the Kerr solution.
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