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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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19 papers · 2 filters
Spinning particles in vacuum spacetimes of different curvature types: Natural reference tetrads, and massless particles
Oldřich Semerák
In a previous paper, we considered the motion of massive spinning test particles in the "pole-dipole" approximation, as described by the Mathisson--Papapetrou--Dixon (MPD) equation…
Entropy/information flux in Hawking radiation
Ana Alonso-Serrano, Matt Visser
Blackbody radiation contains (on average) an entropy of 3.9\pm2.5 bits per photon. If the emission process is unitary, then this entropy is exactly compensated by "hidden informati…
Indirect (source-free) integration method. II. Self-force consistent radial fall
P. Ritter, S. Aoudia, A. Spallicci +1
We apply our method of indirect integration, described in Part I, at fourth order, to the radial fall affected by the self-force. The Mode-Sum regularisation is performed in the Re…
Indirect (source-free) integration method. I. Wave-forms from geodesic generic orbits of EMRIs
P. Ritter, S. Aoudia, A. Spallicci +1
The Regge-Wheeler-Zerilli (RWZ) wave-equation describes Schwarzschild-Droste black hole perturbations. The source term contains a Dirac distribution and its derivative. We have pre…
Near-horizon description of extremal magnetised stationary black holes and Meissner effect
Jiří Bičák, Filip Hejda
After a brief summary of the basic properties of stationary spacetimes representing rotating, charged black holes in strong axisymmetric magnetic fields, we concentrate on extremal…
Electrogeodesics in the di-hole Majumdar-Papapetrou spacetime
Jiří Ryzner, Martin Žofka
We investigate the (electro-)geodesic structure of the Majumdar-Papapetrou solution representing static charged black holes in equilibrium. We assume only two point sources, impart…
Asymptotic gravitational wave fluxes from a spinning particle in circular equatorial orbits around a rotating black hole
Enno Harms, Georgios Lukes-Gerakopoulos, Sebastiano Bernuzzi +1
We present a new computation of the asymptotic gravitational wave energy fluxes emitted by a {\it spinning} particle in circular equatorial orbits about a Kerr black hole. The part…
Spacetimes of Weyl and Ricci type N in higher dimensions
Martin Kuchynka, Alena Pravdova
We study the geometrical properties of null congruences generated by an aligned null direction of the Weyl tensor (WAND) in spacetimes of the Weyl and Ricci type N (possibly with a…
Robinson--Trautman solution with nonlinear electrodynamics
T. Tahamtan, O. Svitek
Explicit Robinson--Trautman solutions with electromagnetic field satisfying nonlinear field equations are derived and analyzed. The solutions are generated from the spherically sym…
Black Holes and Magnetic Fields
Filip Hejda, Jiří Bičák
We briefly summarise the basic properties of spacetimes representing rotating, charged black holes in strong axisymmetric magnetic fields. We concentrate on extremal cases, for whi…
On geodesic dynamics in deformed black-hole fields
Oldřich Semerák, Petra Suková
"Almost all" seems to be known about isolated stationary black holes in asymptotically flat space-times and about the behaviour of {\em test} matter and fields in their backgrounds…
Geodesics in nonexpanding impulsive gravitational waves with , Part I
Clemens Sämann, Roland Steinbauer, Alexander Lecke +1
We investigate the geodesics in the entire class of nonexpanding impulsive gravitational waves propagating in an (anti-)de Sitter universe using the distributional form of the metr…
Spacetimes with a separable Klein-Gordon equation in higher dimensions
Ivan Kolar, Pavel Krtous
We study spacetimes that lead to a separable Klein-Gordon equation in a general dimension. We introduce an ansatz for the metric in higher dimensions motivated by analogical work b…
Killing-Yano forms and Killing tensors on a warped space
Pavel Krtous, David Kubiznak, Ivan Kolar
We formulate several criteria under which the symmetries associated with the Killing and Killing-Yano tensors on the base space can be lifted to the symmetries of the full warped g…
Comparing Hamiltonians of a spinning test particle for different tetrad fields
Daniela Kunst, Tomáš Ledvinka, Georgios Lukes-Gerakopoulos +1
This work is concerned with suitable choices of tetrad fields and coordinate systems for the Hamiltonian formalism of a spinning particle derived in [E. Barausse, E. Racine, and A.…
Kundt spacetimes minimally coupled to scalar field
T. Tahamtan, O. Svitek
We derive an exact solution belonging to Kundt class of spacetimes both with and without a cosmological constant that are minimally coupled to a free massless scalar field. We show…
Spinning particles in vacuum spacetimes of different curvature types
O. Semerák, M. Šrámek
We consider the motion of spinning test particles with nonzero rest mass in the "pole-dipole" approximation, as described by the Mathisson-Papapetrou-Dixon (MPD) equations, and exa…
Weak electromagnetic field admitting integrability in Kerr-NUT-(A)dS spacetimes
Ivan Kolar, Pavel Krtous
We investigate properties of higher-dimensional generally rotating black-hole spacetimes, so called Kerr-NUT-(A)dS spacetimes, as well as a family of related spaces which share the…
Robinson-Trautman solution with scalar hair
T. Tahamtan, O. Svitek
Explicit Robinson-Trautman solution with minimally coupled free scalar field is derived and analyzed. It is shown that this solution contains curvature singularity which is initial…