26 citations · 112 across the 13 of their papers we have counts for
13 papers
Rotating near-horizon extreme geometries in quadratic gravity
Breno L. Giacchini, Ivan Kolář
Rotating near-horizon extreme solutions of quadratic gravity are analyzed combining power series expansions and numerical calculations. Restricting to geometries with symmetries of…
Conical singularity in spacetimes with NUT is observer-dependent
Ivan Kolář, Pavel Krtouš, Maciej Ossowski
We discuss the issue of defining and measuring conical deficits (conicity) in spacetimes with the torsion singularity such as the Misner string in Taub--NUT spacetime. We propose a…
Symmetry reduction of gravitational Lagrangians
Guillermo Frausto, Ivan Kolář, Tomáš Málek +1
We analyze all possible symmetry reductions of Lagrangians that yield fully equivalent field equations for any 4-dimensional metric theory of gravity. Specifically, we present a co…
Dust collapse and horizon formation in Quadratic Gravity
Luca Buoninfante, Francesco Di Filippo, Ivan Kolář +1
Quadratic Gravity supplements the Einstein-Hilbert action by terms quadratic in the spacetime curvature. This leads to a rich phase space of static, compact gravitating objects inc…
Carroll black holes in (A)dS and their higher-derivative modifications
Poula Tadros, Ivan Kolář
We define the Carrollian black holes corresponding to the limit of Schwarzschild-(A)dS spacetime and its higher-derivative counterpart known as Schwarzschild-Bach-(A)dS spacetime,…
Toward regular black holes in sixth-derivative gravity
Breno L. Giacchini, Ivan Kolář
We study spherically symmetric static solutions of the most general sixth-derivative gravity using series expansions. Specifically, we prove that the only solutions of the complete…
Inner-extremal regular black holes from pure gravity
Francesco Di Filippo, Ivan Kolář, David Kubiznak
Recently it was shown that essentially all regular black hole models constructed so far can be obtained as solutions of vacuum gravity equations, upon considering an infinite serie…
Mixing "Magnetic'' and "Electric'' Ehlers--Harrison transformations: The Electromagnetic Swirling Spacetime and Novel Type I Backgrounds
José Barrientos, Adolfo Cisterna, Ivan Kolář +3
In this paper, we obtain a complete list of stationary and axisymmetric spacetimes, generated from a Minkowski spacetime using the Ernst technique. We do so by operating on the ass…
Uniqueness of Galilean and Carrollian limits of gravitational theories and application to higher derivative gravity
Poula Tadros, Ivan Kolář
We show that the seemingly different methods used to derive non-Lorentzian (Galilean and Carrollian) gravitational theories from Lorentzian ones are equivalent. Specifically, the p…
Solutions with pure radiation and gyratons in 3D massive gravity theories
Ercan Kilicarslan, Ivan Kolář
We find exact solutions of topologically massive gravity (TMG) and new massive gravity (NMG) in dimensions (3D) with an arbitrary cosmological constant, pure radiation, and…
Infinite derivative gravity resolves nonscalar curvature singularities
Ivan Kolář, Tomáš Málek
We explicitly demonstrate that the nonlocal ghost-free ultraviolet modification of general relativity (GR) known as the infinite derivative gravity (IDG) resolves nonscalar curvatu…
Carrollian limit of quadratic gravity
Poula Tadros, Ivan Kolář
We study the Carrollian limit of the (general) quadratic gravity in four dimensions. We find that in order for the Carrollian theory to be a modification of the Carrollian limit of…
Propagators in AdS for higher-derivative and nonlocal gravity: Heat kernel approach
Ivan Kolář, Tomáš Málek
We present a new covariant method of construction of the (position space) propagators in the -dimensional (Euclidean) anti-de Sitter background for any gravitational theory with…