74 citations · 178 across the 11 of their papers we have counts for
8 papers · 1 filter
Criticality and Big Brake singularities in the tachyonic evolutions of closed Friedmann universes with cold dark matter
Zsolt Horváth, Zoltán Keresztes, Alexander Yu. Kamenshchik +1
The evolution of a closed Friedmann universe filled by a tachyon scalar field with a trigonometric potential and cold dark matter (CDM) is investigated. A subset of the evolutions…
Weak and strong field approximations and circular orbits of Kehagias-Sfetsos space-time
M. Dwornik, Zs. Horváth, L. Á. Gergely
The Kehagias-Sfetsos asymptotically flat black hole and naked singularity solutions of Hořava-Lifshitz gravity are investigated both in the weak-field and strong-field regimes. In…
Weak gravitational lensing by compact objects in fourth order gravity
Zsolt Horváth, László Á. Gergely, David Hobill +2
We discuss weak lensing characteristics in the gravitational field of a compact object in the low-energy approximation of fourth order f(R) gravity theory. The particular solution…
Black hole tidal charge constrained by strong gravitational lensing
Zsolt Horváth, László Á. Gergely
Spherically symmetric brane black holes have tidal charge, which modifies both weak and strong lensing characteristics. Even if lensing measurements are in agreement with a Schwarz…
Constraining Hořava-Lifshitz gravity by weak and strong gravitational lensing
Zsolt Horváth, László Á. Gergely, Zoltán Keresztes +2
We discuss gravitational lensing in the Kehagias-Sfetsos space-time emerging in the framework of Hořava-Lifshitz gravity. In weak lensing we show that there are three regimes, depe…
Image formation in weak gravitational lensing by tidal charged black holes
Zsolt Horváth, László Árpád Gergely, David Hobill
We derive a generic weak lensing equation and apply it for the study of images produced by tidal charged brane black holes. We discuss the similarities and point out the difference…