10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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- Institute of High Energy PhysicsCN2.6k papers
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17 papers · 2 filters
Closed conformal Killing-Yano initial data
Alfonso García-Parrado, Igor Khavkine
Through an exhaustive search, we produce a 5-parameter family of propagation identities for the closed conformal Killing-Yano equation on 2-forms, which hold on an Einstein cosmolo…
Free motion around black holes with discs or rings: between integrability and chaos -- VI. The Melnikov method
L. Polcar, O. Semerák
Motivated by black holes surrounded by accretion structures, we consider in this series static and axially symmetric black holes "perturbed" gravitationally as being encircled by a…
Uniformly accelerated traveler in an FLRW universe
Morteza Kerachian
This paper provides an analytical treatment of accelerated and geodesic motion within the framework of the Friedmann -Lemaitre-Robertson-Walker (FLRW) spacetime. By employing confo…
Self-force on a static particle near a black hole
Pavel Krtouš, Andrei Zelnikov
We study the self-force acting on a static charged point-like particle near a Schwarzschild black hole. We obtain the point-like particle as a limit of a spacetime describing a big…
Thermodynamics of two black holes
Pavel Krtouš, Andrei Zelnikov
We study a system of two charged non-rotating black holes separated by a strut. Using the exact solution of the Einstein-Maxwell equations, which describes this system, we construc…
Slicing conditions for axisymmetric gravitational collapse of Brill waves
Anton Khirnov, Tomas Ledvinka
In numerical relativity, spacetimes involving compact strongly gravitating objects are constructed as numerical solutions of Einstein's equations. Success of such a process strongl…
Black holes and other exact spherical solutions in Quadratic Gravity
Jiri Podolsky, Robert Svarc, Vojtech Pravda +1
We study static, spherically symmetric vacuum solutions to Quadratic Gravity, extending considerably our previous Rapid Communication [Phys. Rev. D 98, 021502(R) (2018)] on this to…
Classes of non-minimally coupled scalar fields in spatially curved FRW spacetimes
Morteza Kerachian, Giovanni Acquaviva, Georgios Lukes-Gerakopoulos
In this work we perform a dynamical analysis of a broad class of non-minimally coupled real scalar fields in the Friedmann-Robertson-Walker (FRW) spacetime framework. The first par…
Schwarzschild binary supported by an Appell ring
O. Semerák, M. Basovník, P. Kotlařík
We continue to study black holes subjected to strong sources of gravity, again paying special attention to the behaviour of geometry in the black-hole interior. After examining, in…
Symmetry axes of Kerr-NUT-(A)dS spacetimes
Ivan Kolar, Pavel Krtous
We study fixed points of isometries of the higher-dimensional Kerr-NUT-(A)dS spacetimes that form generalizations of symmetry axes. It turns out that, in the presence of nonzero NU…
Conformal Killing Initial Data
Alfonso García-Parrado, Igor Khavkine
We find necessary and sufficient conditions ensuring that the vacuum development of an initial data set of the Einstein's field equations admits a conformal Killing vector. We refe…
Cut-and-paste for impulsive gravitational waves with : The geometric picture
Jiri Podolsky, Clemens Sämann, Roland Steinbauer +1
Impulsive gravitational waves in Minkowski space were introduced by Roger Penrose at the end of the 1960s, and have been widely studied over the decades. Here we focus on non-expan…
Extraction of energy from an extremal rotating electrovacuum black hole: Particle collisions along the axis of symmetry
F. Hejda, J. Bičák, O. B. Zaslavskii
High-energy collisions can occur for radially moving charged test particles in the extremal Reissner-Nordström spacetime if one of the particles is fine-tuned and the collision poi…
Bonnor-Melvin universe with a cosmological constant
Martin Zofka
We generalize the well-known Bonnor-Melvin solution of the Einstein-Maxwell equations to the case of a non-vanishing cosmological constant. The spacetime is again cylindrically sym…
Disk sources of the Kerr and Tomimatsu-Sato spacetimes: construction and physical properties
Tomáš Ledvinka, Jiří Bičák
We construct the disk sources matched to the exact vacuum Kerr and to the two classes of Tomimatsu-Sato spacetimes. We analyze two models of the matter forming these disks. At each…
Probing Dark Energy through Perfect Fluid Thermodynamics
Georgios Lukes-Gerakopoulos, Giovanni Acquaviva, Charalampos Markakis
We demonstrate that the thermodynamics of a perfect fluid describing baryonic matter can, in certain limits, lead to an equation of state similar to that of dark energy. We keep th…
Gyratons in the Robinson-Trautman and Kundt classes
Jiri Podolsky, Robert Svarc
In our previous paper [Phys. Rev. D 89 (2014) 124029], cited as [1], we attempted to find Robinson-Trautman-type solutions of Einstein's equations representing gyratonic sources (m…