199 citations · 212 across the 9 of their papers we have counts for
9 papers
Shadows of rotating traversable wormholes surrounded by plasma
Tsanimir Angelov, Rasim Bekir, Galin Gyulchev +2
We study the influence of the plasma environment on the shadows of stationary axisymmetric wormholes. We consider a sample of several wormhole solutions and plasma distributions fo…
Polarized equatorial emission and hot spots around black holes with a dark matter halo
Tsanimir Angelov, Rasim Bekir, Galin Gyulchev +2
We study the linear polarization of the accretion disk around black holes with a dark matter halo. The interaction of the black hole with the dark matter is modelled by considering…
Observing naked singularities by the present and next-generation Event Horizon Telescope
Valentin Deliyski, Galin Gyulchev, Petya Nedkova +1
We consider the observational signatures of reflective naked singularities as seen by the current and next-generation Event Horizon Telescope (EHT). The reflective naked singularit…
Polarized image of equatorial emission in horizonless spacetimes: naked singularities
Valentin Deliyski, Galin Gyulchev, Petya Nedkova +1
We study the linear polarization from the accretion disk around weakly and strongly naked Janis-Newman-Winicour singularities. We consider an analytical toy model of thin magnetize…
Polarized image of equatorial emission in horizonless spacetimes I: traversable wormholes
Valentin Delijski, Galin Gyulchev, Petya Nedkova +1
We study the linear polarization from the accretion disk around a class of static traversable wormholes. Applying the simplified model of a magnetized fluid ring orbiting in the eq…
Photon surfaces, shadows and accretion disks in gravity with minimally coupled scalar field
Igor Bogush, Dmitri Gal'tsov, Galin Gyulchev +3
In this article, we conduct a sequential study of possible observable images of black hole simulators described by two recently obtained rotating geometries in Einstein gravity, mi…
Image of the thin accretion disk around compact objects in the Einstein-Gauss-Bonnet gravity
Galin Gyulchev, Petya Nedkova, Tsvetan Vetsov +1
We study the optical appearance of a thin accretion disk around compact objects within the Einstein-Gauss-Bonnet gravity. Considering static spherically symmetric black holes and n…
Quasiperiodic oscillations and Tomimatsu-Sato δ = 2 space-time
Ivan Zh. Stefanov, Galin G. Gyulchev, Stoytcho S. Yazadjiev
We model the spacetime of low-mass X-ray binaries with the Tomimatsu-Sato δ = 2 (TS2) metric and study the properties of the orbital and the epicyclic frequencies. The numerical an…
Connection between black-hole quasinormal modes and lensing in the strong deflection limit
Ivan Zh. Stefanov, Stoytcho S. Yazadjiev, Galin G. Gyulchev
The purpose of the current Letter is to give some relations between gravitational lensing in the strong-deflection limit and the frequencies of the quasinormal modes of spherically…