51 citations · 307 across the 15 of their papers we have counts for
15 papers
Coupled quintessence with a generalized interaction term
Robertus Potting, Paulo M. Sá
We investigate a cosmological model in which dark energy, represented by a quintessential scalar field, is directly coupled to a dark-matter perfect fluid. We are interested in sol…
Late-time evolution of the Universe within a two-scalar-field cosmological model
Paulo M. Sá
We investigate the late-time evolution of the Universe within a cosmological model in which dark matter and dark energy are identified with two interacting scalar fields. Using met…
Triple unification of inflation, dark energy, and dark matter in two-scalar-field cosmology
Paulo M. Sá
A unified description of inflation, dark energy, and dark matter is presented within a two-scalar-field cosmological model. Inflation, assumed to be of the warm type, is driven by…
Unified description of dark energy and dark matter within the generalized hybrid metric-Palatini theory of gravity
Paulo M. Sá
The generalized hybrid metric-Palatini theory of gravity admits a scalar-tensor representation in terms of two interacting scalar fields. We show that, upon an appropriate choice o…
Gravitational wave generation in loop quantum cosmology
Paulo M. Sá, Alfredo B. Henriques
We calculate the full spectrum, as observed today, of the cosmological gravitational waves generated within a model based on loop quantum cosmology. It is assumed that the universe…
Gravitational wave generation in hybrid quintessential inflationary models
Paulo M. Sá, Alfredo B. Henriques
We investigate the generation of gravitational waves in the hybrid quintessential inflationary model. The full gravitational-wave energy spectrum is calculated using the method of…