169 citations · 258 across the 4 of their papers we have counts for
5 papers
The Sloan Nearby Cluster Weak Lensing Survey
Jeffrey M. Kubo, James Annis, Frances Mei Hardin +10
We describe and present initial results of a weak lensing survey of nearby () galaxy clusters in the Sloan Digital Sky Survey (SDSS). In this first study, galaxy…
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…
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…
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…
Entropy perturbations in quartessence Chaplygin models
R. R. R. Reis, I. Waga, M. O. Calvao +1
We show that entropy perturbations can eliminate instabilities and oscillations, in the mass power spectrum of the quartessence Chaplygin models. Our results enlarge the current pa…