58 citations · 293 across the 7 of their papers we have counts for
7 papers
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…
Instant preheating mechanism and UHECR
A. H. Campos, J. M. F. Maia, R. Rosenfeld
Top-down models assume that the still unexplained Ultra High Energy Cosmic Rays (UHECR's) are the decay products of superheavy particles. Such particles may have been produced by o…
Current and future supernova constraints on decaying cosmologies
J. S. Alcaniz, J. M. F. Maia
We investigate observational constraints from present and future supernova data on a large class of decaying vacuum cosmologies. In such scenarios the present value of the vacuum e…
The accelerating universe in brane-world cosmology
M. D. Maia, Edmundo M. Monte, J. M. F. Maia
The standard Friedmann universe embedded in a five dimensional and constant curvature bulk is examined without any a priori junction condition between the brane and the bulk. A geo…
Scalar field description of decaying- cosmologies
J. M. F. Maia, J. A. S. Lima
The conditions under which cosmologies driven by time varying cosmological terms can be described by a scalar field coupled to a perfect fluid are discussed. An algorithm to recons…
Extended Warm Inflation
J. M. F. Maia, J. A. S. Lima
A bidimensional parameter space of unitary area is introduced to study phenomenologically the dynamic and thermodynamic behavior of inflationary models driven by a scalar field cou…