59 citations · 279 across the 27 of their papers we have counts for
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gr-qc2021
Fermat's principle in constant gravitational field
Joanna Gonera, Piotr Kosinski, Joanna Piwnik
Recently (Int.Journ.Mod.Phys. D27 (2018), 1847025) an interesting property of closed light rings in Kerr black holes has been noticed. We explain its origin and derive a slightly m…
physics.class-ph2021
Global Symmetries of the Kepler Problem
Joanna Gonera, Piotr Kosinski, Patryk Michel
The global symmetry transformations generated by Runge-Lenz vector of twodimensional Kepler problem are explicitly described. They are given in terms of SU(2) left group multiplica…