2k citations · 12k across the 281 of their papers we have counts for
5 papers · 2 filters
Supernovae constraints on models of dark energy revisited
M. C. Bento, O. Bertolami, N. M. C. Santos +1
We use the Type Ia Supernova gold sample data of Riess {\it et al} in order to constrain three models of dark energy. We study the Cardassian model, the Dvali-Turner gravity modifi…
Astrophysical Constraints on Scalar Field Models
O. Bertolami, J. Paramos
We use stellar structure dynamics arguments to extract bounds on the relevant parameters of scalar field models: the putative scalar field mediator of a fifth force with a Yukawa p…
The Revival of the Unified Dark Energy-Dark Matter Model ?
M. C. Bento, O. Bertolami, A. A. Sen
We consider the generalized Chaplygin gas (GCG) proposal for unification of dark energy and dark matter and show that it admits an unique decomposition into dark energy and dark ma…
Challenges to the Generalized Chaplygin Gas Cosmology
O. Bertolami
The generalized Chaplygin gas (GCG) model allows for an unified description of the cosmologically recent accelerated expansion of the Universe and of the evolution of energy densit…
Time Evolution of the Fine Structure Constant in a Two-Field Quintessence Model
M. C. Bento, O. Bertolami, N. M. C. Santos
We examine the variation of the fine structure constant in the context of a two-field quintessence model. We find that, for solutions that lead to a transient late period of accele…