28 citations · 70 across the 3 of their papers we have counts for
6 papers
Unification of inflation, dark energy, and dark matter within the Salam-Sezgin cosmological model
Alfredo B. Henriques, Robertus Potting, Paulo M. Sá
We investigate a cosmological model, based on the Salam-Sezgin six-dimensional supergravity theory and on previous work by Anchordoqui, Goldberg, Nawata, and Nuñez. Assuming a peri…
Parametric Resonance and Cosmological Gravitational Waves
Paulo M. Sá, Alfredo B. Henriques
We investigate the production of gravitational waves due to quantum fluctuations of the vacuum during the transition from the inflationary to the radiation-dominated eras of the un…
The influence of differential rotation on the detectability of gravitational waves from the r-mode instability
Paulo M. Sá, Brigitte Tomé
Recently, it was shown that differential rotation is an unavoidable feature of nonlinear r-modes. We investigate the influence of this differential rotation on the detectability of…
Nonlinear evolution of r-modes: the role of differential rotation
Paulo M. Sá, Brigitte Tomé
Recent work has shown that differential rotation, producing large scale drifts of fluid elements along stellar latitudes, is an unavoidable feature of r-modes in the nonlinear theo…
Polytropic stars in three-dimensional spacetime
Paulo M. Sá
We investigate three-dimensional perfect fluid stars with polytropic equation of state, matched to the exterior three-dimensional black hole geometry of Banados, Teitelboim and Zan…
Differential rotation of nonlinear r-modes
Paulo M. Sá
Differential rotation of r-modes is investigated within the nonlinear theory up to second order in the mode amplitude in the case of a slowly-rotating, Newtonian, barotropic, perfe…