Kinematical and dynamical aspects of ghost-matter cosmologies
arXiv:2004.02935 · doi:10.1088/1361-6382/abad82
Abstract
We consider the kinematical and dynamical evolution of Friedmann universes with a mixture of non-interacting matter and a ghost-like field, in a scenario analogous to that advocated by the Quintom model. Assuming that the conventional matter dominates today, we find that the ghost component can bring the future expansion and the past contraction of the model to a finite halt. Moreover, at the moment the expansion or contraction stops, we find that the tendency of the universe is to bounce back and re-collapse or re-expand. Therefore, the presence of a (never dominant) ghost-field with negative density could, in principle, drive the universe into an eternal cycle of finite expansion, collapse, and re-expansion. Our study outlines the key features of such a scenario and provides a simple condition for it to occur. We also derive an autonomous set of differential equations and then employ dynamical-system techniques to identify two families of fixed points, with and without spatial curvature respectively. The members of the first family correspond to coasting universes and are stable in the Lyapunov sense. Those of the latter family are unstable repellers when their matter satisfies the strong energy condition and Lyapunov stable in the opposite case.
arXiv commentMinor revision. References added. To appear in CQG
References in corpus (33)
- A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
- Phantom Energy and Cosmic Doomsday
- Exponential potentials and cosmological scaling solutions
- Can the dark energy equation-of-state parameter w be less than -1?
- The phantom menaced: constraints on low-energy effective ghosts
- A Cyclic Model of the Universe
- Towards a Nonsingular Bouncing Cosmology
- Ekpyrotic and Cyclic Cosmology
- Bouncing Universe with Quintom Matter
- Relativistic cosmology and large-scale structure
- Model independent evidence for dark energy evolution from Baryon Acoustic Oscillations
- Kasner and Mixmaster behavior in universes with equation of state w \ge 1
- Cosmology With Negative Potentials
- The implications of an extended dark energy cosmology with massive neutrinos for cosmological tensions
- Graduated dark energy: Observational hints of a spontaneous sign switch in the cosmological constant
- A Matter Bounce By Means of Ghost Condensation
- On Perturbations of Quintom Bounce
- Bouncing Universes with Varying Constants
- Noether symmetry approach in phantom quintessence cosmology
- Internal space structure generalization of the quintom cosmological scenario
- The Cyclic Model Simplified
- Ginzburg-Landau Theory of Dark Energy: A Framework to Study Both Temporal and Spatial Cosmological Tensions Simultaneously
- On the ghost-induced instability on de Sitter background
- The New Ekpyrotic Ghost
- On the stability of static ghost cosmologies
- Bouncing Universe from Nothing
- Friedmann-like universes with weak torsion: a dynamical system approach
- Ghost Cosmology: Exact Solutions, Transitions Between Standard Cosmologies and Ghost Dark Energy/Matter Evolution
- A Dynamical Study of the Friedmann Equations
- Dark energy and inflation invoked in CCGG by locally contorted space-time
- Recent Progress in Fighting Ghosts in Quantum Gravity
- A Cyclic Universe Approach to Fine Tuning
- General relativistic, nonstandard model for the dark sector of the Universe