10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR3.6k papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR3.2k papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR3k papers
- Joint Institute for Nuclear ResearchRU2.7k papers
- Institute for High Energy PhysicsES2.7k papers
- European Organization for Nuclear ResearchCH2.6k papers
- Institut de Recherche sur les Lois Fondamentales de l'UniversFR2.6k papers
- Institute of High Energy PhysicsCN2.6k papers
- Rutherford Appleton LaboratoryGB2.5k papers
- Deutsches Elektronen-Synchrotron DESYDE2.5k papers
- National and Kapodistrian University of AthensGR2.5k papers
- Istituto Nazionale di Fisica Nucleare, Sezione di NapoliIT2.4k papers
26 papers · 2 filters
Kinematic restrictions on particle collisions near extremal black holes: A unified picture
Filip Hejda, Jiří Bičák
In 2009, Banados, Silk and West (BSW) pointed out the possibility of having an unbounded limit of centre-of-mass collision energy for test particles in the field of an extremal Ker…
Extremally charged line
Jiří Ryzner, Martin Žofka
We investigate the properties of a static, cylindrically symmetric Majumdar-Papapetrou-type solution of Einstein-Maxwell equations. We locate its singularities, establish its algeb…
Static axisymmetric rings in general relativity: How diverse they are
O. Semerák
Three static and axially symmetric (Weyl-type) ring singularities -- the Majumdar-Papapetrou--type (extremally charged) ring, the Bach-Weyl ring and the Appell ring -- are studied…
Dynamics and chaos in the unified scalar field cosmology II. System in a finite box
Giovanni Acquaviva, Georgios Lukes-Gerakopoulos
We revisit the global dynamics of unified dark matter cosmological models and analyze it in a new dynamical system setting. In particular, by defining a suitable set of variables w…
Spinning test-body orbiting around Schwarzschild black hole: circular dynamics and gravitational-wave fluxes
Enno Harms, Georgios Lukes-Gerakopoulos, Sebastiano Bernuzzi +1
We consider a spinning test-body in circular motion around a nonrotating black hole and analyze different prescriptions for the body's dynamics. We compare, for the first time, the…
Algebraic classification of Robinson-Trautman spacetimes
Jiri Podolsky, Robert Svarc
We consider a general class of four-dimensional geometries admitting a null vector field that has no twist and no shear but has an arbitrary expansion. We explicitly present the Pe…
On geometry of deformed black holes: II. Schwarzschild hole surrounded by a Bach-Weyl ring
M. Basovník, O. Semerák
We continue to study the response of black-hole space-times on the presence of additional strong sources of gravity. Restricting ourselves to static and axially symmetric (electro-…
On geometry of deformed black holes: I. Majumdar-Papapetrou binary
O. Semerák, M. Basovník
Although black holes are eminent manifestations of very strong gravity, the geometry of space-time around and even inside them can be significantly affected by additional bodies pr…
Completeness of general pp-wave spacetimes and their impulsive limit
Clemens Sämann, Roland Steinbauer, Robert Švarc
We investigate geodesic completeness in the full family of pp-wave or Brinkmann spacetimes in their extended as well as in their impulsive form. This class of geometries contains t…
Spinning particles moving around black holes: integrability and chaos
Georgios Lukes-Gerakopoulos
The motion of a stellar compact object around a supermassive black hole can be approximated by the motion of a spinning test particle. The equations of motion describing such syste…
The dynamics of a spinning particle in a linear in spin Hamiltonian approximation
Georgios Lukes-Gerakopoulos, Matthaios Katsanikas, Panos A. Patsis +1
We investigate for order and chaos the dynamical system of a spinning test particle of mass moving in the spacetime background of a Kerr black hole of mass M. This system is ap…
Quantum fate of timelike naked singularity with scalar hair
O. Svitek, T. Tahamtan, A. Zampeli
We study the quantum fate of a naked curvature singularity sourced by a scalar field via several methods and compare the results obtained. The first method relies on relativistic q…
Exact solutions to quadratic gravity
Vojtech Pravda, Alena Pravdova, Jiri Podolsky +1
Since all Einstein spacetimes are vacuum solutions to quadratic gravity in four dimensions, in this paper we study various aspects of non-Einstein vacuum solutions to this theory.…
Nonsymmetric Dynamical Thin-Shell Wormhole in Robinson--Trautman Class
O. Svitek, T. Tahamtan
The thin-shell wormhole created using the Darmois-Israel formalism applied to Robinson-Trautman family of spacetimes is presented. The stress energy tensor created on the throat is…
Separability of test fields equations on the C-metric background II. Rotating case and the Meissner effect
David Kofroň
We present the separation of the Teukolsky master equation for the test field of arbitrary spin on the background of the rotating C-metric. We also summarize and simplify some know…
Higher dimensional Robinson-Trautman spacetimes sourced by p-forms: static and radiating black holes
Marcello Ortaggio, Jiri Podolsky, Martin Zofka
We summarize results about Robinson-Trautman spacetimes in the presence of an aligned -form Maxwell field and an arbitrary cosmological constant in dimensions. While in…
Comment on "Chaotic orbits for spinning particles in Schwarzschild spacetime"
Georgios Lukes-Gerakopoulos
The astrophysical relevance of chaos for a test particle with spin moving in Schwarzschild spacetime was the objective of \cite{Verhaaren10}. Even if the results of the study seem…
Pressure in Lemaître-Tolman-Bondi solutions and cosmologies
Donald Lynden-Bell, Jiří Bičák
Lemaître-Tolman-Bondi (LTB) solutions have traditionally been confined to systems with no pressure in which the gravity is due to massive dust, but the solutions are little changed…
Separability of test fields equations on the C-metric background
David Kofroň
In the Kerr-Newman spacetime the Teukolsky master equation, governing the fundamental test fields, is of great importance. We derive an analogous master equation for the non-rotati…
Properties of Robinson--Trautman solution with scalar hair
T. Tahamtan, O. Svitek
An explicit Robinson--Trautman solution with minimally coupled free scalar field was derived and analyzed recently. It was shown that this solution possesses a curvature singularit…
Energy-momentum tensors in linearized Einstein's theory and massive gravity: The question of uniqueness
Jiří Bičák, Josef Schmidt
The question of the uniqueness of energy-momentum tensors in the linearized general relativity and in the linear massive gravity is analyzed without using variational techniques. W…
Aspects of Stability of Hairy Black Holes
Andres Anabalon, Jiří Bičák
We analyze spherical and odd-parity linear perturbations of hairy black holes with a minimally coupled scalar field.
The global uniqueness and -regularity of geodesics in expanding impulsive gravitational waves
Jiri Podolsky, Clemens Sämann, Roland Steinbauer +1
We study geodesics in the complete family of expanding impulsive gravitational waves propagating in spaces of constant curvature, that is Minkowski, de Sitter and anti-de Sitter un…
Extremal Black Holes in Strong Magnetic Fields: Near-Horizon Geometries and Meissner Effect
Filip Hejda, Jiří Bičák
For extremal black holes, one can construct simpler, limiting spacetimes that describe the geometry near degenerate horizons. Since these spacetimes are known to have enhanced symm…