Exact solutions of modified GST cosmology
type: Item
instance of: scholarly article
title: Exact solutions of modified GST cosmology
zbMATH Open document ID: 0989.83072
DOI: 10.1088/0264-9381/18/11/306
author: Takao Fukui
author: Kenzo Arai
author: Masaaki Hashimoto
published in: Classical and Quantum Gravity
publication date: 2002-08-05T00:00:00Z
Mathematics Subject Classification ID: 83F05
Mathematics Subject Classification ID: 83D05
zbMATH DE Number: 1642650
zbMATH Keywords: scalar-tensor theory
zbMATH Keywords: cosmology
zbMATH Keywords: cosmological constant
zbMATH Keywords: flatness problem
MaRDI profile type: Publication
full work available at URL: https://doi.org/10.1088/0264-9381/18/11/306
OpenAlex ID: W2023275781
review text: With respect to some of its cosmological implications, a modification of the generalized scalar-tensor theory (GST) is considered. In modified GST, the cosmological term is a function not only of the scalar field \(\phi\) but, via \(\phi_i \phi^i\), also of its time derivative. One of the arguments in favor of this theory given by the authors is that a variable cosmological term and a scalar field are keywords for the present successes of present inflationary cosmology. Exact solutions are deduced for the scale factor, the scalar field and the cosmological term, where the latter evolves with a different dependence on time for each era of the universe. Qualitative considerations to the case of a flat universe provide physically reasonable results to the `cosmological constant' and the `flatness' problems.
reviewed by: Horst-Heino von Borzeszkowski
description: scientific article; zbMATH DE number 1642650