Work

Autonomous dynamical system description of de Sitter evolution in scalar assisted f(R) − ϕ gravity

Year: 2018

Type: article

Abstract: In this paper we will study the cosmological dynamical system of an [Formula: see text] gravity in the presence of a canonical scalar field [Formula: see text] with an exponential potential by constructing the dynamical system in a way that it is rendered autonomous. This feature is controlled by a single variable [Formula: see text], which when it is constant, the dynamical system is autonomous. We focus on the [Formula: see text] case which, as we demonstrate by using a numerical analysis approach, leads to an unstable de Sitter attractor, which occurs after [Formula: see text] [Formula: see text]-foldings. This instability can be viewed as a graceful exit from inflation, which is inherent to the dynamics of de Sitter attractors.

Source: International Journal of Geometric Methods in Modern Physics

DOI: 10.1142/s0219887818502122

Authors: K. Kleidis, V. K. Oikonomou

Institutions: Technological Educational Institute of Central Macedonia, Aristotle University of Thessaloniki

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W2950597338

FWCI: 1.604

Cites: 34

Cited by: 25

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