607 citations
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6 papers · 2 filters
A Note on Energy-Momentum Conservation in Palatini Formulation of L(R) Gravity
Peng Wang, Gilberto M. Kremer, Daniele S. M. Alves +1
By establishing that Palatini formulation of gravity is equivalent to Brans-Dicke theory, we show that energy-momentum tensor is covariantly conserved in this type…
Transition from accelerated to decelerated regimes in JT and CGHS cosmologies
M. H. Christmann, F. P. Devecchi, G. M. Kremer +1
In this work we discuss the possibility of positive-acceleration regimes, and their transition to decelerated regimes, in two-dimensional (2D) cosmological models. We use general r…
Palatini approach to 1/R gravity and its implications to the late Universe
Gilberto M. Kremer, Daniele S. M. Alves
By applying the Palatini approach to the 1/R-gravity model it is possible to explain the present accelerated expansion of the Universe. Investigation of the late Universe limiting…
Irreversible processes and the accelerated-decelerated phases of the Universe
G. M. Kremer, M. C. N. Teixeira da Silva
A model for the Universe is proposed where it is considered as a mixture of scalar and matter fields. The particle production is due to an irreversible transfer of energy from the…
Acceleration field of a Universe modeled as a mixture of scalar and matter fields
Gilberto M. Kremer, Daniele S. M. Alves
A model of the Universe as a mixture of a scalar (inflaton or rolling tachyon from the string theory) and a matter field (classical particles) is analyzed. The particles are create…
Brane cosmology with a van der Waals equation of state
G. M. Kremer
The evolution of a Universe confined onto a 3-brane embedded in a five-dimensional space-time is investigated where the cosmological fluid on the brane is modeled by the van der Wa…