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gr-qc2015★ 3 cited
Scalar curvature of spacelike hypersurfaces and certain class of cosmological models for accelerated expanding universes
Juan A. Aledo, Rafael M. Rubio
We study the scalar curvature of spacelike hypersurfaces in the family of cosmological models known as generalized Robertson-Walker spacetimes, and give several rigidity results un…
gr-qc2014
The Friedmann cosmological models revisited as an harmonic motion and new exact solutions
Rafael M. Rubio, Juan J. Salamanca
A new approach for arbitrary dimension to the Friedmann cosmological models is presented. Taking suitable changes of the parameters of the spacetime the harmonic motion equations a…