A new approximation of photon geodesics in Schwarzschild spacetime

@article{31480,
   author = {La Placa, Riccardo and Bakala, Pavel and Stella, Luigi and Falanga, Maurizio},
   article_number = {7},
   doi = {http://dx.doi.org/10.3847/2515-5172/ab3227},
   language = {eng},
   journal = {Research Notes of the American Astronomical Society},
   title = {A new approximation of photon geodesics in Schwarzschild spacetime},
   volume = {3},
   year = {2019}
}

TY  - JOUR
ID  - 31480
AU  - La Placa, Riccardo - Bakala, Pavel - Stella, Luigi - Falanga, Maurizio
PY  - 2019
TI  - A new approximation of photon geodesics in Schwarzschild spacetime
JF  - Research Notes of the American Astronomical Society
VL  - 3
IS  - 7
N2  - In this research note we introduce a new approximation of photon geodesics in Schwarzschild spacetime which is especially useful to describe highly bent trajectories, for which the angle between the initial emission position and the line of sight to the observer approaches π : this corresponds to the points behind the central mass of the Schwarzschild metric with respect to the observer. The approximation maintains very good accuracy overall, with deviations from the exact numerical results below 1% up to the innermost stable circular orbit (ISCO) located at 6 GM/c2 .
ER  - 

LA PLACA, Riccardo, Pavel BAKALA, Luigi STELLA a Maurizio FALANGA. A new approximation of photon geodesics in Schwarzschild spacetime. Online. \textit{Research Notes of the American Astronomical Society}. 2019, roč.~3, č.~7, 2 s. Dostupné z: https://dx.doi.org/10.3847/2515-5172/ab3227.