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Recently, several ways of obtaining observational proof of the existence of black-hole horizons have been proposed. We argue here that such proof is fundamentally impossible: observations can provide… (More)

- Cezary Cybulski, Dominika Wokołorczyk, +27 authors S. A. Narod
- British Journal of Cancer
- 2013

Background:To evaluate whether genotyping for 18 prostate cancer founder variants is helpful in identifying high-risk individuals and for determining optimal screening regimens.Methods:A serum PSA… (More)

- Dorota Gondek-Rosińska, Nikolaos Stergioulas, Tomasz Bulik, W lodek Kluźniak, Eric Gourgoulhon
- 2001

Observations of kHz quasi-periodic oscillations (QPOs) in the X-ray fluxes of low-mass X-ray binaries (LMXBs) have been used in attempts to constrain the external metric of the compact members of… (More)

We apply Feynman’s principle, “The same equations have the same solutions”, to Kepler’s problem and show that Newton’s dynamics in a properly curved 3-D space is identical with that described by… (More)

- Marek Abramowicz, Omer M. Blaes, J́ı̌ri Horák, W lodek Kluźniak, Paola Rebusco
- 2005

Fluids in external gravity may oscillate with frequencies characteristic of the epicyclic motions of test particles. We explicitly demonstrate that global oscillations of a slender, perfect fluid… (More)

We note that the recently discovered 450 Hz frequency in the X-ray flux of the black hole candidate GRO J1655-40 is in a 3:2 ratio to the previously known 300 Hz frequency of quasi-periodic… (More)

Context: An impulsive increase in luminosity by one half or more of the Eddington value will lead to ejection of all optically thin plasma from Keplerian orbits around the radiating star, if gravity… (More)

- Marek Abramowicz, Tomasz Bulik, Michal Bursa, W lodek Kluźniak
- 2002

We find evidence that the two high frequency QPOs in Sco X-1 are, more often than not, approximately in the 2:3 frequency ratio familiar from studies of black hole candidates (e.g., XTE J1550-564,… (More)

Test particles infalling from infinity onto a compact spherical star with a mildly super-Eddington luminosity at its surface are typically trapped on the “Eddington Capture Sphere” and do not reach… (More)

Heyl (2000) made an interesting suggestion that the observed shifts in QPO frequency in type I X-ray bursts could be influenced by the same geometrical effect of strong gravity as the one that causes… (More)