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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20 papers · 2 filters
Averaging in LRS class II spacetimes
Petr Kaspar, Otakar Svitek
We generalize Buchert's averaged equations [Gen. Rel. Grav. 32, 105 (2000); Gen. Rel. Grav. 33, 1381 (2001)] to LRS class II dust model in the sense that all Einstein equations are…
Modelling Inhomogeneity in Szekeres Spacetime
David Vrba, Otakar Svitek
We study the behaviour of the density contrast in quasi-spherical Szekeres spacetime and derive its analytical behaviour as a function of and . We set up the inhomogeneity u…
Graphene and Black Holes: novel materials to reach the unreachable
Alfredo Iorio
The case for a dedicated laboratory, to test hep-th models on analogue systems, is briefly made. The focus is on graphene.
Thermal relics in cosmology with bulk viscosity
A. Iorio, G. Lambiase
In this paper we discuss some consequences of cosmological models in which the primordial cosmic matter is described by a relativistic imperfect fluid. The latter takes into accoun…
Static and radiating p-form black holes in the higher dimensional Robinson-Trautman class
Marcello Ortaggio, Jiri Podolsky, Martin Zofka
We study Robinson-Trautman spacetimes in the presence of an aligned p-form Maxwell field and an arbitrary cosmological constant in n>=4 dimensions. As it turns out, the character o…
Transformational acoustic metamaterials based on pressure gradients
C. García-Meca, S. Carloni, C. Barceló +3
We apply a homogenization process to the acoustic velocity potential wave equation. The study of various examples shows that the resulting effective properties are different from t…
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…
Effect of radiation flux on test particle motion in the Vaidya spacetime
Donato Bini, Andrea Geralico, Robert T. Jantzen +1
Motion of massive test particles in the nonvacuum spherically symmetric radiating Vaidya spacetime is investigated, allowing for physical interaction of the particles with the radi…
The general relativistic Poynting-Robertson effect. II: A photon flux with nonzero angular momentum
Donato Bini, Andrea Geralico, Robert T. Jantzen +2
We study the motion of a test particle in a stationary, axially and reflection symmetric spacetime of a central compact object, as affected by interaction with a test radiation fie…
Analogue transformation acoustics and the compression of spacetime
C. García-Meca, S. Carloni, C. Barceló +3
A recently developed technique known as analogue transformation acoustics has allowed the extension of the transformational paradigm to general spacetime transformations under whic…
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…
Ultrarelativistic boost with scalar field
O. Svitek, T. Tahamtan
We present the ultrarelativistic boost of the general global monopole solution which is parametrized by mass and deficit solid angle. The problem is addressed from two different pe…
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…
Hairy black holes: stability under odd-parity perturbations and existence of slowly rotating solutions
Andres Anabalon, Jiří Bičák, Joel Saavedra
We show that, independently of the scalar field potential and of specific asymptotic properties of the spacetime (asymptotically flat, de Sitter or anti-de Sitter), any static, sph…
Renormalizability of the Dirac Equation in Torsion-Gravity with Non-Minimal Coupling
Luca Fabbri, Stefano Vignolo, Sante Carloni
We will consider the torsional completion of gravity for a background filled with Dirac matter fields, studying what happens when fermionic non-minimal coupling is taken into accou…
Exact solutions and their interpretation - session A1
Jiří Bičák, Jacek Tafel
We report on the oral contributions and give a list of posters presented in the session A1 "Exact solutions and their interpretation" at the 20th International Conference on Genera…
On the Bondi mass of Maxwell-Klein-Gordon spacetimes
Martin Scholtz, Lukáš Holka
In this paper we calculate the Bondi mass of asymptotically flat spacetimes with interacting electromagnetic and scalar fields. The system of coupled Einstein-Maxwel-Klein-Gordon e…
Analytic conformal compactification of Schwarzschild spacetime
Jakub Haláček, Tomáš Ledvinka
Among the coordinates used to construct a conformal compactification of the Schwarzschild spacetime, none of them simultaneously extend smoothly both through an event horizon and b…
Non minimally coupled condensate cosmologies: a phase space analysis
Sante Carloni, Stefano Vignolo, Roberto Cianci
We present an analysis of the phase space of cosmological models based on a non minimal coupling between the geometry and a fermionic condensate. We obtain that the strong constrai…