1k citations · 5.3k across the 39 of their papers we have counts for
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Extended f(R,L_m) theories of gravity
Francisco S. N. Lobo, Tiberiu Harko
We consider a maximal extension of the Hilbert-Einstein action and analyze several interesting features of the theory. More specifically, the motion is non-geodesic and takes place…
Geodesic deviation, Raychaudhuri equation, and tidal forces in modified gravity with an arbitrary curvature-matter coupling
Tiberiu Harko, Francisco S. N. Lobo
The geodesic deviation equation, describing the relative accelerations of nearby particles, and the Raychaudhury equation, giving the evolution of the kinematical quantities associ…
Extended gravity with generalized scalar field and kinetic term dependences
Tiberiu Harko, Francisco S. N. Lobo, Olivier Minazzoli
We generalize previous work by considering a novel gravitational model with an action given by an arbitrary function of the Ricci scalar, the matter Lagrangian density, a scalar fi…
Irreversible thermodynamic description of interacting dark energy - dark matter cosmological models
Tiberiu Harko, Francisco S. N. Lobo
We investigate the interaction between dark energy and dark matter in the framework of irreversible thermodynamics of open systems with matter creation/annihilation. We consider da…
New derivation of the Lagrangian of a perfect fluid with a barotropic equation of state
Olivier Minazzoli, Tiberiu Harko
In this paper we give a simple proof that when the particle number is conserved, the Lagrangian of a barotropic perfect fluid is , where $ρ…
Wormholes supported by hybrid metric-Palatini gravity
Salvatore Capozziello, Tiberiu Harko, Tomi S. Koivisto +2
Recently, a modified theory of gravity was presented, which consists of the superposition of the metric Einstein-Hilbert Lagrangian with an term constructed à la Palati…