80 citations · 166 across the 6 of their papers we have counts for
7 papers · 1 filter
Gravitational radiospectrometer
G. S. Bisnovatyi-Kogan, O. Yu. Tsupko
Gravitational lensing is predicted by general relativity and is found in observations. When a gravitating body is surrounded by a plasma, the lensing angle depends on a frequency o…
Gravitational lensing by gravitational waves
G. S. Bisnovatyi-Kogan, O. Yu. Tsupko
Gravitational lensing by gravitational wave is considered. We notice that although final and initial direction of photons coincide, displacement between final and initial trajector…
Strong Gravitational Lensing by Schwarzschild Black Holes
G. S. Bisnovatyi-Kogan, O. Yu. Tsupko
The properties of the relativistic rings which show up in images of a source when a black hole lies between the source and observer are examined. The impact parameters are calculat…
Primordial Black Hole: Mass and Angular Momentum Evolution
G. S. Bisnovatyi-Kogan, O. Yu. Tsupko
The evolution of the primordial low mass black hole (PBH) in hot universe is considered. Increase of mass and decrease of PBH spin due to the accretion of radiation dominated matte…
Dynamic stabilization of non-spherical bodies against unlimited collapse
G. S. Bisnovatyi-Kogan, O. Yu. Tsupko
We solve equations, describing in a simplified way the newtonian dynamics of a selfgravitating nonrotating spheroidal body after loss of stability. We find that contraction to a si…
Approximate dynamics of dark matter ellipsoids
G. S. Bisnovatyi-Kogan, O. Yu. Tsupko
The collapse of non-collisional dark matter and the formation of pancake structures in the Universe are investigated approximately. Collapse is described by a system of ordinary di…