15 citations · 62 across the 9 of their papers we have counts for
9 papers
Extremal isolated horizons of the NUT type
Eryk Buk, Denis Dobkowski-Ryłko, Jerzy Lewandowski +1
We provide a construction of a new class of axisymmetric extremal isolated horizons admitting a structure of U(1)-principal fiber bundle over a two-sphere. In contrast to the previ…
Quadrupole formulae with cosmological constant: comparison
Denis Dobkowski-Ryłko, Jerzy Lewandowski
We consider three different approaches (by Ashtekar, Bonga and Kesavan; Hoque and Virmani; and Dobkowski-Ryłko and Lewandowski) to investigate gravitational radiation produced by t…
Isolated horizons of the Hopf bundle structure transversal to the null direction, the horizon equations and embeddability in NUT-like spacetimes
Denis Dobkowski-Ryłko, Jerzy Lewandowski, Maciej Ossowski
Isolated horizons that admit the Hopf bundle structure are investigated, however the null direction is allowed not to be tangent to the bundle fibres. The geomet…
A generalization of the quadruple formula for the energy of gravitational radiation in de Sitter spacetime
Denis Dobkowski-Ryłko, Jerzy Lewandowski
We study gravitational radiation produced by time changing matter source in de Sitter spacetime. We consider a cosmological Killing horizon instead of the conformal boundary used i…
Petrov type D equation on horizons of nontrivial bundle topology
Denis Dobkowski-Ryłko, Jerzy Lewandowski, István Rácz
We consider -dimensional isolated horizons (IHs) generated by null curves that form nontrivial bundles. We find a natural interplay between the IH geometry and the …
The Near Horizon Geometry Equation on Compact 2-Manifolds Including the General Solution for g > 0
Denis Dobkowski-Ryłko, Wojciech Kamiński, Jerzy Lewandowski +1
The Near Horizon Geometry (NHG) equation with a cosmological constant Λ is considered on compact 2-dimensional manifolds. It is shown that every solution satisfies the Type D equat…