20 citations · 64 across the 13 of their papers we have counts for
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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…
QPOs in microquasars: the spin problem
Gabriel Torok, Marek A. Abramowicz, Zdenek Stuchlik +1
In the Galactic microquasars with double peak kHz quasi-periodic oscillations (QPOs), the ratio of the two frequencies is 3:2. This supports the suggestion that double peak kHz QPO…
Wavelet analysis of MCG-6-30-15 and NGC 4051: a possible discovery of QPOs in 2:1 and 3:2 resonance
Pawel Lachowicz, Bozena Czerny, Marek A. Abramowicz
Following our previous work of Lachowicz & Czerny (2005), we explore further the application of the continuous wavelet transform to X-ray astronomical signals. Using the public arc…
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…