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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…
Modified gravity with arbitrary coupling between matter and geometry
T. Harko
The field equations of a generalized type gravity model, in which there is an arbitrary coupling between matter and geometry, are obtained. The equations of motion for test…
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…
Is dark matter an extra-dimensional effect?
M. E. Kahil, T. Harko
We investigate the possibility that the observed behavior of test particles outside galaxies, which is usually explained by assuming the presence of dark matter, is the result of 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…