296 citations · 447 across the 6 of their papers we have counts for
5 papers · 1 filter
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…
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…
-exponential inflation
J. S. Alcaniz, F. C. Carvalho
An inflationary scenario driven by a slow rolling homogeneous scalar field whose potential is given by a generalized exponential function is discussed. Within the {\sl slow-…
Gravitational lensing constraints on dark energy from modified Friedmann equations
Abha Dev, J. S. Alcaniz, Deepak Jain
The existence of a dark energy component has usually been invoked as the most plausible way to explain the recent observational results. However, it is also well known that effects…
Cosmological implications of old galaxies at high redshifts
J. A. S. Lima, J. S. Alcaniz
Old high- galaxies are important tools for understanding the structure formation problem and may become the key to determine the ultimate fate of the Universe. In this {\it lett…