3 citations · 4 across the 5 of their papers we have counts for
6 papers · 1 filter
Luminosity, redshift and gas abundance in general relativistic radiation hydrodynamics
Janusz Karkowski, Edward Malec, Krzysztof Roszkowski +1
Quasi-stationary flows of gas accreting onto a compact center are analyzed in the framework of general-relativistic radiation hydrodynamics, under assumptions of spherical symmetry…
General relativistic accretion with backreaction
Janusz Karkowski, Bogusz Kinasiewicz, Patryk Mach +2
The spherically symmetric steady accretion of polytropic perfect fluids onto a black hole is the simplest flow model that can demonstrate the effects of backreaction. Backreaction…
The general Penrose inequality: lessons from numerical evidence
Janusz Karkowski, Edward Malec
Formulation of the Penrose inequality becomes ambiguous when the past and future apparent horizons do cross. We test numerically several natural possibilities of stating the inequa…
On conformally flat initial data for Einstein equations
Janusz Karkowski, Edward Malec
We describe conformally flat initial data, with explicitly given analytic extrinsic curvature solving the vacuum momentum constraints. They follow from a solution of Dain and Fried…
How loud can Schwarzschild black holes ring?
Janusz Karkowski, Edward Malec, Zdobyslaw Swierczynski
A numerical procedure is described for the maximization of the energy diffusion due to the backscattering of the gravitational radiation. The obtained maxima are solutions dominate…
Schwarzschild black holes and propagation of electromagnetic and gravitational waves
Janusz Karkowski, Edward Malec, Zdobyslaw Swierczynski
Disturbing of a spacetime geometry may result in the appearance of an oscillating and damped radiation - the so-called quasinormal modes. Their periods of oscillations and damping…