296 citations · 447 across the 6 of their papers we have counts for
8 papers · 1 filter
Testing power-law cosmology with galaxy clusters
Zong-Hong Zhu, Ming Hu, J. S. Alcaniz +1
Power-law cosmologies, in which the cosmological scale factor evolves as a power law in the age, with $α\ga 1$, regardless of the matter content or cosmological epo…
Observational constraints on late-time Lambda(t) cosmology
S. Carneiro, M. A. Dantas, C. Pigozzo +1
The cosmological constant, i.e., the energy density stored in the true vacuum state of all existing fields in the Universe, is the simplest and the most natural possibility to desc…
Cosmological bounds on oscillating dark energy models
Deepak Jain, Abha Dev, J. S. Alcaniz
We study some cosmological constraints on the two phenomenological models of oscillating dark energy. In these scenarios, the equation of state of dark energy varies periodically a…
Energy conditions in f(R)-gravity
J. Santos, J. S. Alcaniz, M. J. Reboucas +1
In order to shed some light on the current discussion about f(R)-gravity theories we derive and discuss the bounds imposed by the energy conditions on a general f(R) functional for…
Coupled quintessence and vacuum decay
F. E. M. Costa, J. S. Alcaniz, J. M. F. Maia
We discuss observational consequences of a class of cosmological models characterized by the dilution of pressureless matter attenuated with respect to the usual scaling d…
Lookback time bounds from energy conditions
J. Santos, J. S. Alcaniz, M. J. Reboucas +1
In general relativity, the energy conditions are invoked to restrict general energy-momentum tensors on physical grounds. We show that in the standard Friedmann-Lemaitre-Robertson-…