402 citations · 1.8k across the 74 of their papers we have counts for
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3D numerical study of an anisotropic heat transfer in outer layers of magnetized neutron stars
I. A. Kondratyev, S. G. Moiseenko, G. S. Bisnovatyi-Kogan +1
Periodic changes in a thermal soft X-ray flux of a rotating neutron star indicate a non-uniform distribution of the surface temperature. A possible cause of this phenomenon is a su…
First analytical calculation of black hole shadow in McVittie metric
Oleg Yu. Tsupko, Gennady S. Bisnovatyi-Kogan
Cosmic expansion influences the angular size of black hole shadow. The most general way to describe a black hole embedded into an expanding universe is to use the McVittie metric.…
Shadow of black holes at local and cosmological distances
G. S. Bisnovatyi-Kogan, O. Yu. Tsupko, V. Perlick
A brief illustrative discussion of the shadows of black holes at local and cosmological distances is presented. Starting from definition of the term and discussion of recent observ…
Hills and holes in the microlensing light curve due to plasma environment around gravitational lens
Oleg Yu. Tsupko, Gennady S. Bisnovatyi-Kogan
In this paper, we investigate the influence of the plasma surrounding the gravitational lens on the effect of microlensing. In presence of plasma around the lens, the deflection an…
Time lag in transient galactic and extragalactic accreting sources
Franco Giovannelli, Gennady S. Bisnovatyi-Kogan
X-ray binaries are cauldrons of fundamental physical processes which appear along practically the whole electromagnetic spectrum. The sub-class of X-ray transient sources show mult…
Two body problem in presence of cosmological constant
G. S. Bisnovatyi-Kogan, M. Merafina
We consider the Kepler two-body problem in presence of the cosmological constant . Contrary to the classical case, where finite solutions exist for any angular momentum of the s…