3 papers
gr-qc2025
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…
gr-qc2025
Conical singularity in spacetimes with NUT is observer-dependent
Ivan Kolář, Pavel Krtouš, Maciej Ossowski
We discuss the issue of defining and measuring conical deficits (conicity) in spacetimes with the torsion singularity such as the Misner string in Taub--NUT spacetime. We propose a…
gr-qc2024
Vacuum Petrov type D horizons of non-trivial bundle structure over Riemann surfaces with genus
Jerzy Lewandowski, Maciej Ossowski
We consider isolated horizons (Killing horizons up to the second order) whose null flow has the structure of a U(1) principal fiber bundle over a compact Riemann surface. We impose…