Linear stability of Einstein and de Sitter universes in the quadratic theory of modified gravity

Autor:	Mudhahir Al-Ajmi
Rok vydání:	2021
Předmět:	Physics General Relativity and Quantum Cosmology symbols.namesake Gravity (chemistry) Quadratic equation De Sitter universe symbols Einstein Linear stability Mathematical physics
Zdroj:	SciPost Physics Proceedings.
ISSN:	2666-4003
Popis:	We consider the Einstein static and the de Sitter universe solutions and examine their instabilities in a subclass of quadratic modified theories for gravity. This modification proposed by Nash is an attempt to generalize general relativity. Interestingly, we discover that the Einstein static universe is unstable in the context of the modified gravity. In contrast to Einstein static universe, the de Sitter universe remains stable under metric perturbation up to the second order.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c3138117eb05e8e35aabe78597b530a6 https://doi.org/10.21468/scipostphysproc.4.012 Zobrazit plný text záznamu