43 citations · 80 across the 5 of their papers we have counts for
5 papers
FRW in cosmological self-creation theory
Juan M. Ramírez, J. Socorro
We use the Brans-Dicke theory from the framework of General Relativity (Einstein frame), but now the total energy momentum tensor fulfills the following condition $\rm <[\{1}ϕT^{μν…
A Conceptual Tour About the Standard Cosmological Model
Antonio L. Maroto, Juan Ramirez
With the beginning of the XXIst century, a physical model of our Universe, usually called the Standard Cosmological Model (SCM), is reaching an important level of consolidation, ba…
A decoupled system of hyperbolic equations for linearized cosmological perturbations
J. Ramirez, S. Kopeikin
A decoupled system of hyperbolic partial differential equations for linear perturbations around any spatially flat FRW universe is obtained for a wide class of perturbations. The c…
Cosmological perturbations: a new gauge-invariant approach
Sergei M. Kopeikin, Juan Ramirez, Bahram Mashhoon +1
A new gauge-invariant approach for describing cosmological perturbations is developed. It is based on a physically motivated splitting of the stress-energy tensor of the perturbati…
Generation of gravitational waves by generic sources in de Sitter space-time
H. J. de Vega, J. Ramirez, N. Sanchez
We study the generation of gravitational radiation by sources moving in the de Sitter background. Exploiting the maximal symmetry and the conformal flatness of de Sitter space-time…