932 citations · 3.2k across the 35 of their papers we have counts for
23 papers · 1 filter
Dark Interactions and Cosmological Fine-Tuning
Miguel Quartin, Mauricio O. Calvao, Sergio E. Joras +2
Cosmological models involving an interaction between dark matter and dark energy have been proposed in order to solve the so-called coincidence problem. Different forms of coupling…
Cosmology, Thermodynamics and Matter Creation
J. A. S. Lima, M. O. Calvao, I. Waga
Several approaches to the matter creation problem in the context of cosmological models are summarily reviewed. A covariant formulation of the general relativistic imperfect simple…
Bulk viscosity and deflationary universes
J. A. S. Lima, R. Portugal, I. Waga
We analyze the conditions that make possible the description of entropy generation in the new inflationary model by means of a nearequilibrium process. We show that there are situa…
When did cosmic acceleration start? How fast was the transition?
Emille E. O. Ishida, Ribamar R. R. Reis, Alan V. Toribio +1
Cosmic acceleration is investigated through a kink-like expression for the deceleration parameter (q). The new parametrization depends on the initial (q_i) and final (q_f) values o…
Challenges for scaling cosmologies
Luca Amendola, Miguel Quartin, Shinji Tsujikawa +1
A cosmological model that aims at solving the coincidence problem should show that dark energy and dark matter follow the same scaling solution from some time onward. At the same t…
Is it possible to observationally distinguish adiabatic Quartessence from LambdaCDM?
L. Amendola, M. Makler, R. R. R. Reis +1
The equation of state (EOS) in quartessence models interpolates between two stages: at high energy densities and at small ones. In the quartessence models…