32 citations · 63 across the 8 of their papers we have counts for
8 papers
Thin accretion discs around spherically symmetric configurations with nonlinear scalar fields
O. S. Stashko, V. I. Zhdanov, A. N. Alexandrov
We study stable circular orbits (SCO) around static spherically symmetric configuration of General Relativity with a non-linear scalar field (SF). The configurations are described…
Verification of Einstein's formula for gravitational deflection of light using observations of Galactic microlensing
A. N. Alexandrov, V. M. Sliusar, V. I. Zhdanov
The potential of the gravitational microlensing inside our Galaxy for testing the Einstein formula for the gravitational light deflection is discussed. For this purpose, the lens m…
Gravitational microlensing as a probe for dark matter clumps
E. Fedorova, V. M. Sliusar, V. I. Zhdanov +3
Extended dark matter (DM) substructures may play the role of microlenses in the Milky Way and in extragalactic gravitational lens systems (GLSs). We compare microlensing effects ca…
Gravitational lens equation. Critical solutions and magnification near folds and cusps
A. N. Alexandrov, S. M. Koval, V. I. Zhdanov
We study approximate solutions of the gravitational lens equation and corresponding lens magnification factor near the critical point. This consideration is based on the Taylor exp…
Caustic Crossing Events and Source Models in Gravitational Lens Systems
A. N. Alexandrov, V. M. Sliusar, V. I. Zhdanov
High amplification events (HAEs) are common phenomena in extragalactic gravitational lens systems (GLSs), where the multiple images of a distant quasar are observed through a foreg…
Asymptotic Expansions and Amplification of a Gravitational Lens Near a Fold Caustic
A. N. Alexandrov, V. I. Zhdanov
We propose two methods that enable us to obtain approximate solutions of the lens equation near a fold caustic with an arbitrary degree of accuracy. We obtain "post-linear" correct…