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Non-minimal curvature-matter couplings in modified gravity
Orfeu Bertolami, Tiberiu Harko, Francisco S. N. Lobo +1
Recently, in the context of f(R) modified theories of gravity, it was shown that a curvature-matter coupling induces a non-vanishing covariant derivative of the energy-momentum, im…
Thin accretion disks onto brane world black holes
C. S. J. Pun, Z. Kovacs, T. Harko
The braneworld description of our universe entails a large extra dimension and a fundamental scale of gravity that might be lower by several orders of magnitude as compared to the…
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…
Quark-Hadron Phase Transitions in Brane-World Cosmologies
Giuseppe De Risi, Tiberiu Harko, Francisco S. N. Lobo +1
When the universe was about 10 seconds old, a first order cosmological quark - hadron phase transition occurred at a critical temperature of around 200 MeV. In this work, we stu…
Thin accretion disks in f(R) modified gravity models
C. S. J. Pun, Z. Kovacs, T. Harko
We consider the basic physical properties of matter forming a thin accretion disc in the static and spherically symmetric space-time metric of the vacuum modified gravity mo…
Jacobi stability of the vacuum in the static spherically symmetric brane world models
T. Harko, V. S. Sabau
We analyze the stability of the structure equations of the vacuum in the brane world models, by using both the linear (Lyapunov) stability analysis, and the Jacobi stability analys…