Quasi-evaporating black holes and cold dark matter (2009)
Vilkovisky has claimed to have solved the black hole back reaction problem and finds that black holes lose only ten percent of their mass to Hawking radiation before evaporation ceases. We examine...
Rendering Dark Energy Void (2009)
February, Sean, Larena, Julien, Smith, Mathew, Clarkson, Chris
Dark energy observations may be explained within general relativity using an inhomogeneous Hubble-scale depression in the matter density and accompanying curvature, which evolves naturally out of an...
The influence of structure formation on the cosmic expansion (2009)
Clarkson, Chris, Ananda, Kishore, Larena, Julien
We investigate the effect that the average backreaction of structure formation has on the dynamics of the cosmological expansion, within the concordance model. Our approach in the Poisson gauge is...
Power-law cosmic expansion in f(R) gravity models (2009)
Goheer, Naureen, Larena, Julien, Dunsby, Peter K. S.
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 cosmological solutions which...
Testing backreaction effects with observations (2008)
Larena, Julien, Alimi, Jean--Michel, Buchert, Thomas, Kunz, Martin, Corasaniti, Pier-Stefano
In order to quantitatively test the ability of averaged inhomogeneous cosmologies to correctly describe observations of the large scale properties of the Universe, we introduce a smoothed template...
Champs scalaires en cosmologie: discussions sur les principes d'équivalence et cosmologique. (2007)
La cosmologie est actuellement à un tournant de l'histoire de son développement. L'abondance de données observationnelles diverses et précises a permis de développer et de confirmer un modèle...
Integrability of anisotropic and homogeneous Universes in scalar-tensor theory of gravitation (2007)
In this paper, we develop a method based on the analysis of the Kovalewski exponents to study the integrability of anisotropic and homogeneous Universes. The formalism is developed in scalar-tensor...
Champs scalaires en cosmologie: discussions sur les principes d'équivalence et cosmologique. (2007)
La cosmologie est actuellement à un tournant de l'histoire de son développement. L'abondance de données observationnelles diverses et précises a permis de développer et de confirmer un modèle...
Champs scalaires en cosmologie: discussions sur les principes d'équivalence et cosmologique. (2007)
La cosmologie est actuellement à un tournant de l'histoire de son développement. L'abondance de données observationnelles diverses et précises a permis de développer et de confirmer un modèle...
Champs scalaires en cosmologie: discussions sur les principes d'équivalence et cosmologique. (2007)
La cosmologie est actuellement à un tournant de l'histoire de son développement. L'abondance de données observationnelles diverses et précises a permis de développer et de confirmer un modèle...
Reinterpreting quintessential dark energy through averaged inhomogeneous cosmologies (2006)
Larena, Julien, Buchert, Thomas, Alimi, Jean-Michel
Regionally averaged relativistic cosmologies have recently been considered as a possible explanation for the apparent late time acceleration of the Universe. This contribution reports on a mean field...
Buchert, Thomas, Larena, Julien, Alimi, Jean-Michel
Spatially averaged inhomogeneous cosmologies in classical general relativity can be written in the form of effective Friedmann equations with sources that include backreaction terms. In this paper we...
Big Bang nucleosynthesis in scalar tensor gravity: the key problem of the $^7$Li abundance (2005)
Larena, Julien, Alimi, Jean-Michel, Serna, Arturo
Combined with other CMB experiments, the WMAP survey provides an accurate estimate of the baryon density of the Universe. In the framework of the standard Big Bang Nucleosynthesis (BBN), such a...