Showing papers on "Deceleration parameter published in 1990"
TL;DR: In this article, the authors solve a Kantowski-Sachs cosmological model with a constant deceleration parameter, by means of a convenient definition of the overall scale factor.
Abstract: We solve a Kantowski-Sachs cosmological model with a constant deceleration parameter, by means of a convenient definition of the overall scale factor This model is very simple, and as such, it deserves attention
7 citations
TL;DR: In this article, the authors generalize Weinberg's results for the radiation phase and show that any realistic model of this kind contains gravitational instabilities, provided that q > 0.
Abstract: A well-known solution, for a flat model in general relativity obeying the Robertson-Walker metric, a perfect fluid energy-tensor and a perfect gas law of state, with constant deceleration parameter, is now shown to yield growing scalar density perturbations, provided thatq > 0. This study generalizes Weinberg's results for the radiation phase, and shows that any realistic model of this kind contains gravitational instabilities
3 citations
TL;DR: In this article, the authors used the maximum likelihood method to derive a (formal) value of the deceleration parameter q0 from the Hubble diagram of brightest cluster galaxies (no evolution is assumed).
2 citations