Publikace ÚTF

APPROXIMATING LIGHT RAYS IN THE SCHWARZSCHILD FIELD

Semerák, O.

A short formula is suggested that approximates photon trajectories in the Schwarzschild field better than other
simple prescriptions from the literature. We compare it with various “low-order competitors,” namely, with those
following from exact formulas for small M, with one of the results based on pseudo-Newtonian potentials, with
a suitably adjusted hyperbola, and with the effective and often employed approximation by Beloborodov. Our
main concern is the shape of the photon trajectories at finite radii, yet asymptotic behavior is also discussed,
important for lensing. An example is attached indicating that the newly suggested approximation is usable—and
very accurate—for practically solving the ray-deflection exercise.
typ:article
journal:The Astrophysical Journal
volume:800
pages:77 (12 pp)
year:2015

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