2015/11/04 by Juan A. Aledo, Rafael M. Rubio · 1 citation
Physics and Astronomy · #gr-qc
paper · pdf · doi:10.1016/j.geomphys.2016.02.005
arXiv admin note: text overlap with arXiv:1503.00120
arxiv created 2015/11/04 · arxiv updated 2016/03/23
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 under appropriate mathematical and physical assumptions. On the other hand, we show that this family of spacetimes provides suitable models obeying the null convergence condition to explain accelerated expanding universes.