71 citations · 90 across the 3 of their papers we have counts for
11 papers
Effective cosmological "constant " and quintessence
R. de Ritis, A. A. Marino
In this paper we present exactly solved extended quintessence models; furthermore, through a dynamical effective Q-cosmological "constant", we recover some of the L decaying cases…
Tracker fields from nonminimally coupled theory
R. de Ritis, A. A. Marino, C. Rubano +1
We extend the concept of quintessence to a flat nonminimally coupled scalar - tensor theories of gravity. By means of Noether's symmetries for the cosmological pointlike Lagrangian…
Quintessence duality
R. de Ritis, A. A. Marino, C. Rubano +1
We join quintessence cosmological scenarios with the duality simmetry existing in string dilaton cosmologies. Actually, we consider the tracker potential type and sho…
Asymptotic Freedom Cosmology
S. Capozziello, R. de Ritis, A. A. Marino
For a general class of scalar--tensor gravity theories, we discuss how to recover asymptotic freedom regimes when cosmic time . Such a feature means that the effecti…
Recovering the effective cosmological constant in extended gravity theories
S. Capozziello, R. de Ritis, A. A. Marino
In the framework of extended gravity theories, we discuss the meaning of a time dependent "cosmological constant" and give a set of conditions to recover asymptotic de Sitter behav…
Some aspects of the cosmological conformal equivalence between ``Jordan Frame'' and ``Einstein Frame''
Salvatore Capozziello, Ruggiero de Ritis, Alma Angela Marino
The conformal equivalence between Jordan frame and Einstein frame can be used in order to search for exact solutions in general theories of gravity in which scalar fields are minim…