220 citations · 665 across the 7 of their papers we have counts for
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Testing Hořava-Lifshitz gravity using thin accretion disk properties
Tiberiu Harko, Zoltán Kovács, Francisco S. N. Lobo
Recently, a renormalizable gravity theory with higher spatial derivatives in four dimensions was proposed by Horava. The theory reduces to Einstein gravity with a non-vanishing cos…
Can accretion disk properties distinguish gravastars from black holes?
Tiberiu Harko, Zoltán Kovács, Francisco S. N. Lobo
Gravastars, hypothetic astrophysical objects, consisting of a dark energy condensate surrounded by a strongly correlated thin shell of anisotropic matter, have been proposed as an…
Thin accretion disks in stationary axisymmetric wormhole spacetimes
Tiberiu Harko, Zoltán Kovács, Francisco S. N. Lobo
In this paper, we study the physical properties and the equilibrium thermal radiation emission characteristics of matter forming thin accretion disks in stationary axially symmetri…
Electromagnetic signatures of thin accretion disks in wormhole geometries
Tiberiu Harko, Zoltán Kovács, Francisco S. N. Lobo
In this paper, we study the physical properties and characteristics of matter forming thin accretion disks in static and spherically symmetric wormhole spacetimes. In particular, t…
Gravitational dynamics in s+1+1 dimensions II. Hamiltonian theory
Zoltán Kovács, László Á. Gergely
We develop a Hamiltonian formalism of brane-world gravity, which singles out two preferred, mutually orthogonal directions. One is a unit twist-free field of spatial vectors with i…
Canonical Analysis of Radiating Atmospheres of Stars in Equilibrium
Zoltán Kovács, László Á. Gergely, Zsolt Horváth
The spherically symmetric, static spacetime generated by a cross-flow of non-interacting null dust streams can be conveniently interpreted as the radiation atmosphere of a star, wh…