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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18 papers · 2 filters
Quantization of inhomogeneous spacetimes with cosmological constant term
Adamantia Zampeli, Andronikos Paliathanasis
We show that the Szekeres system with cosmological constant admits a sufficient number of conservation laws, which allow to claim the integrability of the system. The main novelty…
Black holes and other spherical solutions in quadratic gravity with a cosmological constant
Vojtech Pravda, Alena Pravdova, Jiri Podolsky +1
We study static spherically symmetric solutions to the vacuum field equations of quadratic gravity in the presence of a cosmological constant . Motivated by the trace no-hair th…
Losing the trace to find dynamical Newton or Planck constants
Pavel Jiroušek, Keigo Shimada, Alexander Vikman +1
We show that promoting the trace part of the Einstein equations to a trivial identity results in the Newton constant being an integration constant. Thus, in this formulation the Ne…
On the compatibility of Nonlinear Electrodynamics models with Robinson--Trautman geometry
T. Tahamtan
Robinson--Trautman solutions with Nonlinear Electrodynamics are investigated for both L(F ) and L(F, G) Lagrangians and presence of electric and magnetic charges as well as electro…
On the nature of cosmic strings in black hole spacetimes
David Kofroň
A new model for cosmic strings (i.e. conical singularities) attached to black holes is proposed. These string are obtained by a explicit construction via limiting process from the…
Quantum phenomenological gravitational dynamics: A general view from thermodynamics of spacetime
Ana Alonso-Serrano, Marek Liška
In this work we derive general quantum phenomenological equations of gravitational dynamics and analyse its features. The derivation uses the formalism developed in thermodynamics…
Kundt spacetimes in the Einstein-Gauss-Bonnet theory
Robert Svarc, Jiri Podolsky, Ondrej Hruska
We systematically investigate the complete class of vacuum solutions in the Einstein-Gauss-Bonnet gravity theory which belong to the Kundt family of non-expanding, shear-free and t…
Accelerating NUT black holes
Jiri Podolsky, Adam Vratny
We present and analyze a class of exact spacetimes which describe accelerating black holes with a NUT parameter. First, we verify that the intricate metric found by Chng, Mann and…
Reversing the Null Limit of the Szekeres Metric
Charles Hellaby, Otakar Svítek
The null limits of the Lemaitre-Tolman and Szekeres spacetimes are known to be the Vaidya and news-free Robinson-Trautman metrics. We generalise this result to the case of non-zero…
Scalar Hairy Black Holes in the presence of Nonlinear Electrodynamics
T. Tahamtan
We study influence of scalar fields on Nonlinear Electrodynamics spacetimes. The investigation is carried out using both test and gravitating scalar fields. After revisiting Einste…
The exterior gravitational potential of toroids
J. -M. Huré, B. Basillais, V. Karas +2
We perform a bivariate Taylor expansion of the axisymmetric Green function in order to determine the exterior potential of a static thin toroidal shell having a circular section, a…
Explicit Triangular Decoupling of the Separated Lichnerowicz Tensor Wave Equation on Schwarzschild into Scalar Regge-Wheeler Equations
Igor Khavkine
We consider the vector and the Lichnerowicz wave equations on the Schwarzschild spacetime, which correspond to the Maxwell and linearized Einstein equations in harmonic gauges (or,…
Point particles and Appell's solutions on the axis of Kerr black hole for arbitrary spin in terms of the Debye potentials
David Kofroň
The Teukolsky master equation -- a fundamental equation for test fields of any spin, or perturbations, in type D spacetimes -- is classically treated in its separated form. Then th…
Vortex solutions of Liouville equation and quasi spherical surfaces
Alfredo Iorio, Pavel Kus
We identify the two-dimensional surfaces corresponding to certain solutions of the Liouville equation of importance for mathematical physics, the non-topological Chern-Simons (or J…
Quantum Distinction of Inertial Frames: Local vs. Global
Wan Cong, Jiri Bicak, David Kubiznak +1
We study the response function of Unruh-deWitt detectors placed in a flat spacetime inside a thin matter shell. We show that the response function distinguishes between the local a…
Energy of weak gravitational waves in spacetimes with a positive cosmological constant
P. T. Chruściel, Sk Jahanur Hoque, Tomasz Smołka
We derive a formula for the total canonical energy, and its flux, of weak gravitational waves on a de Sitter background.
Dynamics of classes of barotropic fluids in spatially curved FRW spacetimes
Morteza Kerachian, Giovanni Acquaviva, Georgios Lukes-Gerakopoulos
In this article we perform dynamical analysis of a broad class of barotropic fluids in the spatially curved Friedmann-Robertson-Walker (FRW) spacetime background without considerin…
Gravity waves in parity-violating Copernican Universes
Stephon Alexander, Leah Jenks, Pavel Jiroušek +2
In recent work minimal theories allowing the variation of the cosmological constant by means of a balancing torsion, have been proposed. It was found that such theories contain par…