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Exact analytical solutions of the Susceptible-Infected-Recovered (SIR) epidemic model and of the SIR model with equal death and birth rates

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Wormhole geometries in f(R) modified theories of gravity

- F. Lobo, Miguel Oliveira
- Physics
- 30 September 2009

In this work, we construct traversable wormhole geometries in the context of f (R) modified theories of gravity. We impose that the matter threading the wormhole satisfies the energy conditions, so… Expand

Metric-Palatini gravity unifying local constraints and late-time cosmic acceleration

- T. Harko, T. Koivisto, F. Lobo, G. J. Olmo
- Physics
- 5 October 2011

We present a novel approach to modified theories of gravity which consists of adding to the Einstein- Hilbert Lagrangian an fðRÞ term constructed ala Palatini. Using the respective dynamically… Expand

Extra force in f(R) modified theories of gravity

- O. Bertolami, C. Boehmer, T. Harko, F. Lobo
- Physics
- 13 April 2007

The equation of motion for massive particles in f(R) modified theories of gravity is derived. By considering an explicit coupling between an arbitrary function of the scalar curvature, R, and the… Expand

Stable dark energy stars

- F. Lobo
- Physics
- 28 August 2005

The gravastar picture is an alternative model to the concept of a black hole, where there is an effective phase transition at or near where the event horizon is expected to form, and the interior is… Expand

Phantom energy traversable wormholes

- F. Lobo
- Physics
- 23 February 2005

It has been suggested that a possible candidate for the present accelerated expansion of the Universe is 'phantom energy'. The latter possesses an equation of state of the form… Expand

Morris-Thorne wormholes with a cosmological constant

- J. Lemos, F. Lobo, S. Q. Oliveira
- Physics
- 12 February 2003

First, the ideas introduced in the wormhole research field since the work of Morris and Thorne are reviewed, namely, the issues of energy conditions, wormhole construction, stability, time machines… Expand

Stability of phantom wormholes

- F. Lobo
- Physics
- 31 May 2005

It has recently been shown that traversable wormholes may be supported by phantom energy. In this work phantom wormhole geometries are modeled by matching an interior traversable wormhole solution,… Expand

Hybrid metric-Palatini gravity

- S. Capozziello, T. Harko, T. Koivisto, F. Lobo, G. J. Olmo
- Physics
- 19 August 2015

Recently, the phenomenology of f(R) gravity has been scrutinized motivated by the possibility to account for the self-accelerated cosmic expansion without invoking dark energy sources. Besides, this… Expand

Linearized stability analysis of thin-shell wormholes with a cosmological constant

- F. Lobo, P. Crawford
- Physics
- 1 November 2003

Spherically symmetric thin-shell wormholes in the presence of a cosmological constant are constructed applying the cut-and-paste technique implemented by Visser. Using the Darmois–Israel formalism… Expand

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