3 papers
gr-qc2024
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…
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…
gr-qc2024
Status of Birkhoff's theorem in polymerized semiclassical regime of Loop Quantum Gravity
Luca Cafaro, Jerzy Lewandowski
The collapse of a spherically symmetric ball of dust has been intensively studied in Loop Quantum Gravity (LQG). From a quantum theory, it is possible to recover a semiclassical re…