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6 papers · 2 filters
Constraint-preserving boundary conditions in the Z4 Numerical Relativity formalism
C. Bona, T. Ledvinka, C. Palenzuela-Luque +1
The constraint-preserving approach, which aim is to provide consistent boundary conditions for Numerical Relativity simulations, is discussed in parallel with other recent developm…
Higher dimensional black holes in external magnetic fields
Marcello Ortaggio
We apply a Harrison transformation to higher dimensional asymptotically flat black hole solutions, which puts them into an external magnetic field. First, we magnetize the Schwarzs…
The Efroimsky formalism adapted to high-frequency perturbations
Otakar Svitek, Jiri Podolsky
The Efroimsky perturbation scheme for consistent treatment of gravitational waves and their influence on the background is summarized and compared with classical Isaacson's high-fr…
Geodesic motion in the Kundt spacetimes and the character of envelope singularity
Jiri Podolsky, Miroslav Belan
We investigate geodesics in specific Kundt type N (or conformally flat) solutions to Einstein's equations. Components of the curvature tensor in parallelly transported tetrads are…
A snapping cosmic string in a de Sitter or anti-de Sitter universe
J. Podolsky, J. B. Griffiths
We present and describe an exact solution of Einstein's equations which represents a snapping cosmic string in a vacuum background with a cosmological constant . The snapping of…
Static fluid cylinders and their fields: global solutions
J. Bicak, T. Ledvinka, B. G. Schmidt +1
The global properties of static perfect-fluid cylinders and their external Levi-Civita fields are studied both analytically and numerically. The existence and uniqueness of global…