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Boundary term in metric f (R) gravity: field equations in the metric formalism
The main goal of this paper is to get in a straightforward form the field equations in metric f (R) gravity, using elementary variational principles and adding a boundary term in the action, insteadExpand
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Entanglement Entropy of Black Shells
We present a coherent account of how the entanglement interpretation, thermofield dynamical description and the brick wall formulations (with the ground state correctly identified) fit into aExpand
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Can Interplanetary Measures Bound the Cosmological Constant
Introducing the cosmological constant into Einstein's field equations, we determine a bound for this constant using the values observed from Mercury's perihelion shift. The bound that we find isExpand
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Noncommutative geometry-inspired rotating black hole in three dimensions
We find a new rotating black hole in three-dimensional anti-de Sitter space using an anisotropic perfect fluid inspired by the noncommutative black hole. We deduce the thermodynamical quantities ofExpand
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Evolution of magnetic fields through cosmological perturbation theory
The origin of galactic and extra-galactic magnetic fields is an unsolved problem in modern cosmology. A possible scenario comes from the idea of these fields emerged from a small field, a seed, whichExpand
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Geodesic deviation equation in Bianchi cosmologies
We present the Geodesic Deviation Equation (GDE) for the Friedmann Robertson Walker(FRW) universe and we compare it with the equation for Bianchi type I model. We justify consider this cosmologicalExpand
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Gravitational Lensing by Wormholes
Natural wormholes and its astrophysical signatures have been suggested in various opportunities. By applying the strong field limit of gravitational lensing theory, we calculate the deflection angleExpand
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Cosmological simulations: a tool for understanding the formation of large scale structure and connection with the Newtonian cosmology
In this work we study the cosmological simulations as a tool to understand the formation of large-scale structure of the universe, for this, we show the equivalence of Newtonian cosmology withExpand
Shear Dynamics in Bianchi I Cosmology
We present the exact equation for evolution of Bianchi I cosmological model, considering a non-tilted perfect fluid in a matter dominated universe. We use the definition of shear tensor and later weExpand
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