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Beltrán Jiménez, José ; Cruz Dombriz, Álvaro de la ; Dunsby, Peter K. S. ; Sáez Gómez, Diego | IOP publishing ltd | 2014-05-21One possible explanation for the present observed acceleration of the Universe is the breakdown of homogeneity and isotropy due to the formation of non-linear structures. How inhomogeneities affect the averaged cosmological expansion rate and le[...]texto impreso
Abebe, Amare ; Abdelwahab, Mohamed ; Cruz Dombriz, Álvaro de la ; Dunsby, Peter K. S. | Institute of Physics | 2012-07-07We study the evolution of scalar cosmological perturbations in the 1 + 3 covariant gauge-invariant formalism for generic f(R) theories of gravity. Extending previous works, we give a complete set of equations describing the evolution of matter a[...]texto impreso
Abebe, Amare ; Cruz Dombriz, Álvaro de la ; Dunsby, Peter K. S. | American Physical Society | 2013-08-26Over the past few years much attention has been given to the study of modified gravity theories in order to find a more natural explanation for the late time acceleration of the Universe. Nevertheless, a comparison of the matter power spectrum p[...]texto impreso
de la Cruz Dombriz, Alvaro ; Dunsby, Peter K. S. ; Consolini Busti, Vinicius ; Kandhai, Sulona | APS | 2014-01-01Despite the extraordinary attention that modified gravity theories have attracted over the past decade, the geodesic deviation equation in this context has not received proper formulation thus far. This equation provides an elegant way to invest[...]
