401 citations · 871 across the 28 of their papers we have counts for
28 papers
Exact Bachian singularity in quadratic gravity
Simon Knoska, David Kofron, Robert Svarc
For specifically coupled values of the quadratic gravity parameters, we present a fully explicit static spherically symmetric solution. It contains the central singularity surround…
Linear perturbations of Kerr black hole in quadratic gravity
Simon Knoska, David Kofron, Robert Svarc
Employing the Newman-Penrose formalism and following the classic Teukolsky-like approach, we linearise the field equations of quadratic gravity on the Kerr background and combine t…
Cut-and-paste for impulsive gravitational waves with : The mathematical analysis
Clemens Sämann, Benedict Schinnerl, Roland Steinbauer +1
Impulsive gravitational waves are theoretical models of short but violent bursts of gravitational radiation. They are commonly described by two distinct spacetime metrics, one of l…
An interpretation of spacetimes with expanding impulsive gravitational waves generated by snapped cosmic strings
David Kofron, Michal Karamazov, Robert Svarc
The geometric properties of spacetimes representing expanding impulsive gravitational waves, propagating on a flat background and generated by snapped cosmic strings, are studied.…
The Newman-Penrose formalism in quadratic gravity
Robert Svarc, Alena Pravdova, David Miskovsky
The quadratic gravity constraints are reformulated in terms of the Newman-Penrose-like quantities. In such a frame language, the field equations represent a linear algebraic system…
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…
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…
Prospects for Fundamental Physics with LISA
Enrico Barausse, Emanuele Berti, Thomas Hertog +318
In this paper, which is of programmatic rather than quantitative nature, we aim to further delineate and sharpen the future potential of the LISA mission in the area of fundamental…
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…
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…
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…
All solutions of Einstein's equations in 2+1 dimensions: -vacuum, pure radiation, or gyratons
Jiri Podolsky, Robert Svarc, Hideki Maeda
Under a weak assumption of the existence of a geodesic null congruence, we present the general solution of the Einstein field equations in three dimensions with any value of the co…
Decreasing entropy of dynamical black holes in critical gravity
Hideki Maeda, Robert Svarc, Jiri Podolsky
Critical gravity is a quadratic curvature gravity in four dimensions which is ghost-free around the AdS background. Constructing a Vaidya-type exact solution, we show that the area…
Explicit black hole solutions in higher-derivative gravity
Jiri Podolsky, Robert Svarc, Vojtech Pravda +1
We present, in an explicit form, the metric for all spherically symmetric Schwarzschild-Bach black holes in Einstein-Weyl theory. In addition to the black hole mass, this complete…
Exact black holes in quadratic gravity with any cosmological constant
Robert Svarc, Jiri Podolsky, Vojtech Pravda +1
We present a new explicit class of black holes in general quadratic gravity with a cosmological constant. These spherically symmetric Schwarzschild-Bach-(anti-)de Sitter geometries…
Penrose junction conditions extended: impulsive waves with gyratons
Jiri Podolsky, Robert Svarc, Roland Steinbauer +1
We generalize the classical junction conditions for constructing impulsive gravitational waves by the Penrose "cut and paste" method. Specifically, we study nonexpanding impulses w…
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…
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…
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.…
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…
The global existence, uniqueness and C^1-regularity of geodesics in nonexpanding impulsive gravitational waves
Jiri Podolsky, Clemens Sämann, Roland Steinbauer +1
We study geodesics in the complete family of nonexpanding impulsive gravitational waves propagating in spaces of constant curvature, that is Minkowski, de Sitter and anti-de Sitter…
Algebraic structure of Robinson-Trautman and Kundt geometries in arbitrary dimension
Jiri Podolsky, Robert Svarc
We investigate the Weyl tensor algebraic structure of a fully general family of D-dimensional geometries that admit a non-twisting and shear-free null vector field k. From the coor…
Gyratonic pp-waves and their impulsive limit
Jiri Podolsky, Roland Steinbauer, Robert Svarc
We investigate a class of gravitational pp-waves which represent the exterior vacuum field of spinning particles moving with the speed of light. Such exact spacetimes are described…
Absence of gyratons in the Robinson-Trautman class
Robert Svarc, Jiri Podolsky
We present the Riemann and Ricci tensors for a fully general non-twisting and shear-free geometry in arbitrary dimension D. This includes both the non-expanding Kundt and expanding…