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33 papers · 1 filter
A topologically flat thick 2-brane on higher dimensional black hole backgrounds
Viktor G. Czinner
We present a numerical solution for a topologically flat 2-dimensional thick brane on a higher dimensional, spherically symmetric black hole background. Present solution is the las…
Collapse and dispersal in massless scalar field models
Swastik Bhattacharya, Rituparno Goswami, Pankaj S. Joshi
The phenomena of collapse and dispersal for a massless scalar field has drawn considerable interest in recent years, mainly from a numerical perspective. We give here a sufficient…
Power-law cosmic expansion in f(R) gravity models
Naureen Goheer, Julien Larena, Peter K. S. Dunsby
We show that within the class of f(R) gravity theories, FLRW power-law perfect fluid solutions only exist for R^n gravity. This significantly restricts the set of exact cosmologica…
Geometrical order-of-magnitude estimates for spatial curvature in realistic models of the Universe
Thomas Buchert, George F R Ellis, Henk van Elst
The thoughts expressed in this article are based on remarks made by Jürgen Ehlers at the Albert-Einstein-Institut, Golm, Germany in July 2007. The main objective of this article is…
On the co-existence of matter dominated and accelerating solutions in f(G)-gravity
Naureen Goheer, Rituparno Goswami, Peter K. S. Dunsby +1
Working within the theory of modified Gauss-Bonnet gravity, we show that FLRW--like power--law solutions only exist for a very special class of f(G)theories. Furthermore, we point…
Spatially averaged cosmology in an arbitrary coordinate system
J. Larena
This paper presents a general averaging procedure for a set of observers which are tilted with respect to the cosmological matter fluid. After giving the full set of equations desc…