w=1/3 to w=-1 evolution in a Robertson-Walker space-time with constant scalar curvature
Abstract
The Ricci tensor of a Robertson-Walker space-time is here specified by requiring constancy of the scalar curvature and a vanishing spatial curvature. By entering this Ricci tensor in Einstein's equations (without cosmological constant), the cosmological fluid shows a transition from a pure radiation to a Lambda equation of state. In other words, the RW geometry with constant scalar curvature and flat space, fixes the limit values w=1/3 and w=-1, without any hypothesis on the cosmological fluid. The value of the scalar curvature fixes the time-scale for the transition. For this reason, we investigate the 'toy-universe' with Hubble parameter h = 0.673 and temperature Tcmb = 2.72K. The model predicts an age of the universe in the range 7.3-13.7 Gyr.
Keywords
Cite
@article{arxiv.1905.06218,
title = {w=1/3 to w=-1 evolution in a Robertson-Walker space-time with constant scalar curvature},
author = {Luca Guido Molinari and Carlo Alberto Mantica},
journal= {arXiv preprint arXiv:1905.06218},
year = {2019}
}
Comments
8 pages, 2 figures - submitted draft