Gravitational contraction and curvature singularities in f(R) gravity

6th International Workshop DICE2012 Spacetime – Matter – Quantum Mechanics: From the Planck Scale to Emergent Phenomena

物理学;力学

Reverberi, L.^1,2

Dipartimento di Fisica e Scienze della Terra, Università Degli Studi di Ferrara Polo Scientifico e Tecnologico-Edificio C, Via Saragat 1, 44122 Ferrara, Italy^1

Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Ferrara Polo Scientifico e Tecnologico-Edificio C, Via Saragat 1, 44122 Ferrara, Italy^2

关键词: Accelerated expansion of the universe;    Early universe;    General Relativity;    Gravity model;    Pressureless;    Time-scales;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/442/1/012036/pdf
DOI  :  10.1088/1742-6596/442/1/012036

学科分类：力学，机械学

来源: IOP

【 摘 要 】

The discovery of the accelerated expansion of the Universe has had a vast resonance on a number of physical disciplines. In recent years a few viable modified gravity models have been proposed, which naturally lead to a late-time de Sitter stage while reducing to General Relativity in the early Universe. We study two of these models during the contraction of a homogeneous cloud of pressureless dust. We show how the increasing energy/mass density may lead to a curvature singularity and derive the typical timescales for its development.