Coasting cosmologies with time dependent cosmological constant
General Relativity and Quantum Cosmology
2009-10-31 v1
Abstract
The effect of a time dependent cosmological constant is considered in a family of scalar tensor theories. Friedmann-Robertson-Walker cosmological models for vacumm and perfect fluid matter are found. They have a linear expansion factor, the so called coasting cosmology, the gravitational "constant" decreace inversely with time; this model satisfy the Dirac hipotesis. The cosmological "constant" decreace inversely with the square of time, therefore we can have a very small value for it at present time.
Cite
@article{arxiv.gr-qc/9807016,
title = {Coasting cosmologies with time dependent cosmological constant},
author = {Luis O. Pimentel and L. M. Diaz-Rivera},
journal= {arXiv preprint arXiv:gr-qc/9807016},
year = {2009}
}
Comments
7 pages, latex file (ijmpal macro), accepted for publication in Int. Mod. Phys. A