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5 papers · 2 filters
On the collapse in fourth order gravities
B. Montes Núñez, J. A. R. Cembranos, A. de la Cruz-Dombriz
The gravitational collapse in fourth order theories of gravity defined by an arbitrary action of the scalar curvature shows significant deviations with General Relativity. The pres…
On the absence of the usual weak-field limit, and the impossibility of embedding some known solutions for isolated masses in cosmologies with f(R) dark energy
Timothy Clifton, Peter Dunsby, Rituparno Goswami +1
The problem of matching different regions of spacetime in order to construct inhomogeneous cosmological models is investigated in the context of Lagrangian theories of gravity cons…
Focusing of geodesic congruences in an accelerated expanding Universe
F. D. Albareti, J. A. R. Cembranos, A. de la Cruz-Dombriz
We study the accelerated expansion of the Universe through its consequences on a congruence of geodesics. We make use of the Raychaudhuri equation which describes the evolution of…
A New Type of Exact Arbitrarily Inhomogeneous Cosmology: Evolution of Deceleration in the Flat Homogeneous-On-Average Case
Charles Hellaby
A new method for constructing exact inhomogeneous universes is presented, that allows variation in 3 dimensions. The resulting spacetime may be statistically uniform on average, or…
Cosmic Electromagnetic Fields due to Perturbations in the Gravitational Field
Bishop Mongwane, Peter K. S. Dunsby, Bob Osano
We use non-linear gauge-invariant perturbation theory to study the interaction of an inflation produced seed magnetic field with density and gravitational wave perturbations in an…