314 citations · 5.3k across the 121 of their papers we have counts for
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astro-ph2006★ 20 cited
The twin paradox on the photon sphere
Marek A. Abramowicz, Stanislaw Bajtlik, Wlodek Kluzniak
We consider a new version of the twin paradox. The twins move along the same circular free photon path around the Schwarzschild center. In this case, despite their different veloci…
astro-ph2006★ 3 cited
A non-linear resonance model for the black hole and neutron star QPOs: theory supported by observations
Gabriel Torok, Marek A. Abramowicz, Wlodek Kluzniak +1
Kilohertz Quasi-Periodic Oscillations (QPOs) have been detected in many accreting X-ray binaries. It has been suggested that the highest QPO frequencies observed in the modulation…