367 citations · 1.9k across the 22 of their papers we have counts for
24 papers
Crossing SNe Ia and BAO observational constraints with local ones in hybrid metric-Palatini gravity
Iker Leanizbarrutia, Francisco S. N. Lobo, Diego Saez-Gomez
In this paper, we consider the recently proposed hybrid metric-Palatini gravitational theory, which consists of adding to the Einstein-Hilbert Lagrangian an term c…
Cosmological future singularities in interacting dark energy models
Jose Beltran Jimenez, Diego Rubiera-Garcia, Diego Saez-Gomez +1
The existence of interactions between dark matter and dark energy has been widely studied, since they can fit well the observational data and may provide new physics through such a…
Testing the concordance model in cosmology with model-independent methods: some issues
Diego Saez-Gomez
Since the number of dark energy models have rapidly increased over the last years, some model-independent methods have been developed in order to analyse the cosmological evolution…
Constraining gravity models using type Ia supernovae
Diego Saez-Gomez, C. Sofia Carvalho, Francisco S. N. Lobo +1
We present an analysis of an extension of the Teleparallel Equivalent of General Relativity, where denotes the torsion and the trace of the en…
Spotting deviations from R^2 inflation
Alvaro de la Cruz-Dombriz, Emilio Elizalde, Sergei D. Odintsov +1
We discuss the soundness of inflationary scenarios in theories beyond the Starobinsky model, namely a class of theories described by arbitrary functions of the Ricci scalar and the…
Observational constraints on cosmological future singularities
Jose Beltran Jimenez, Ruth Lazkoz, Diego Saez-Gomez +1
In this work we consider a family of cosmological models featuring future singularities. This type of cosmological evolution is typical of dark energy models with an equation of st…
Analyzing modified unimodular gravity via Lagrange multipliers
Diego Saez-Gomez
The so-called unimodular version of General Relativity is revisited. Unimodular gravity is constructed by fixing the determinant of the metric, what leads to the trace-free part of…
Theoretical and observational constraints of viable f(R) theories of gravity
Alvaro de la Cruz-Dombriz, Peter K. S. Dunsby, Sulona Kandhai +1
Modified gravity has attracted much attention over the last few years and remains a potential candidate for dark energy. In particular, the so-called viable f(R) gravity theories,…
Generalized gravity and the late-time cosmic acceleration
Sebastian Bahamonde, Christian G. Boehmer, Francisco S. N. Lobo +1
High-precision observational data have confirmed with startling evidence that the Universe is currently undergoing a phase of accelerated expansion. This phase, one of the most imp…
Is cosmography a useful tool for testing cosmology?
Vinicius C. Busti, Peter K. S. Dunsby, Alvaro de la Cruz-Dombriz +1
Model-independent methods in cosmology has become an essential tool in order to deal with an increasing number of theoretical alternatives for explaining the late-time acceleration…
Junction conditions in extended Teleparallel gravities
Alvaro de la Cruz-Dombriz, Peter K. S. Dunsby, Diego Saez-Gomez
In the context of extended Teleparallel gravity theories, we address the issue of junction conditions required to guarantee the correct matching of different regions of spacetime.…
Backreaction mechanism in multifluid and extended cosmologies
Jose Beltran Jimenez, Alvaro de la Cruz-Dombriz, Peter K. S. Dunsby +1
One 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 inhom…
Cosmological solutions in F(T) gravity with the presence of spinor fields
Ratbay Myrzakulov, Diego Saez-Gomez, Petr Tsyba
The presence of spinor fields is considered in the framework of some extensions of teleparallel gravity, where the Weitzenböck connection is assumed. Some well known models as the…
Anisotropic Universe Models in f(T) Gravity
M. E. Rodrigues, M. J. S. Houndjo, D. Saez-Gomez +1
We investigate the cosmological reconstruction in anisotropic universe for both homogeneous and inhomogeneous content of the universe. Special attention is attached to three intere…
Cyclic, ekpyrotic and little rip universe in modified gravity
Shin'ichi Nojiri, Sergei D. Odintsov, Diego Saez-Gomez
We propose the reconstruction of gravity in such a way that corresponding theory admits cyclic and ekpyrotic universe solutions. The number of explicit examples of such $F(R…
On the CDM Universe in gravity
Ratbay Myrzakulov, Diego Sáez-Gómez, Anca Tureanu
In the context of the so-called Gauss-Bonnet gravity, where the gravitational action includes function of the Gauss-Bonnet invariant, we study cosmological solutions, especially th…
Unifying inflation with dark energy in modified F(R) Horava-Lifshitz gravity
E. Elizalde, S. Nojiri, S. D. Odintsov +1
We study FRW cosmology for a non-linear modified F(R) Horava-Lifshitz gravity which has a viable convenient counterpart. A unified description of early-time inflation and late-time…
On the LCDM Universe in f(R) gravity
Peter K. S. Dunsby, Emilio Elizalde, Rituparno Goswami +2
Several different explicit reconstructions of f(R) gravity are obtained from the background FRW expansion history. It is shown that the only theory whose Lagrangian is a simple fun…
Cardy-Verlinde formula in FRW Universe with inhomogeneous generalized fluid and dynamical entropy bounds near the future singularity
Iver Brevik, Shin'ichi Nojiri, Sergei D. Odintsov +1
We derive a Cardy-Verlinde-like formula which relates the entropy of the closed FRW universe to its energy, and Casimir energy, for a multicomponent coupled fluid. The generalized…
LambdaCDM epoch reconstruction from F(R,G) and modified Gauss-Bonnet gravities
Emilio Elizalde, Ratbay Myrzakulov, Valery V. Obukhov +1
Dark energy cosmology is considered in a modified Gauss-Bonnet model of gravity with and without a scalar field. It is shown that these generalizations of General Relativity endow…
Cosmological reconstruction of realistic modified F(R) gravities
Shin'ichi Nojiri, Sergei D. Odintsov, Diego Saez-Gomez
The cosmological reconstruction scheme for modified gravity is developed in terms of e-folding (or, redshift). It is demonstrated how any FRW cosmology may emerge from speci…
Casimir Effects Near the Big Rip Singularity in Viscous Cosmology
Iver Brevik, Olesya Gorbunova, Diego Saez-Gomez
Analytical properties of the scalar expansion in the cosmic fluid are investigated, especially near the future singularity, when the fluid possesses a constant bulk viscosity ζ. In…
Modified f(R) gravity from scalar-tensor theory and inhomogeneous EoS dark energy
Diego Sáez-Gómez
The reconstruction of f(R)-gravity is showed by using an auxiliary scalar field in the context of cosmological evolution, this development provide a way of reconstruct the form of…
Oscillating Universe from inhomogeneous EoS and coupled dark energy
Diego Sáez-Gómez
An occurrence of an oscillating Universe is showed using an inhomogeneous equation of state for dark energy fluid. The Hubble parameter described presents a periodic behavior such…