3 papers
gr-qc2026
Perturbation theory for gravitational shadows in Kerr-like spacetimes
Kirill Kobialko, Dmitri Gal'tsov
We present a fully analytical method for calculating the key parameters of a Kerr-like gravitational shadow, including its horizontal and vertical diameters, and , the c…
gr-qc2025
Gravitational shadow and emission spectrum of thin accretion disks in a plasma medium
Kirill Kobialko, Dmitri Gal'tsov, Alexey Molchanov
In anticipation of future multi-frequency observations of black hole with the Next Generation Event Horizon Telescope (ngEHT), we construct spectral images of a thin accretion disk…
gr-qc2024
Perturbation theory for gravitational shadows in static spherically symmetric spacetimes
Kirill Kobialko, Dmitri Gal'tsov
We develop a perturbation theory for surfaces confining photons and massive particles in static spherically symmetric spacetimes in terms of two parameters: the mass-to-energy rati…