Repository logo
 

Friedmann-like universes with weak torsion: a dynamical system approach

Published version
Peer-reviewed

Change log

Authors

Barrow, JD 
Tsagas, CG 
Fanaras, G 

Abstract

jats:titleAbstract</jats:title> jats:pWe consider Friedmann-like universes with torsion and take a step towards studying their stability. In so doing, we apply dynamical-system techniques to an autonomous system of differential equations, which monitors the evolution of these models via the associated density parameters. Assuming relatively weak torsion, we identify the system’s equilibrium points. These are found to represent homogeneous and isotropic spacetimes with nonzero torsion that undergo accelerated expansion. We then examine the linear stability of the aforementioned fixed points. Our results indicate that Friedmann-like cosmologies with weak torsion are generally stable attractors, either asymptotically or in the Lyapunov sense. In addition, depending on the equation of state of the matter, the equilibrium states can also act as intermediate saddle points, marking a transition from a torsional to a torsion-free universe.</jats:p>

Description

Keywords

5107 Particle and High Energy Physics, 5101 Astronomical Sciences, 5102 Atomic, Molecular and Optical Physics, 51 Physical Sciences

Journal Title

European Physical Journal C

Conference Name

Journal ISSN

1434-6044
1434-6052

Volume Title

79

Publisher

Springer Science and Business Media LLC
Sponsorship
Science and Technology Facilities Council (ST/P000673/1)