Bouncing cosmology from nonlinear dark energy with two cosmological constants
arXiv:2302.03710 · doi:10.1103/PhysRevD.107.083533
Abstract
We explore the dynamics of FLRW cosmologies which consist of dark matter, radiation and dark energy with a quadratic equation of state. Standard cosmological singularities arise due to energy conditions which are violated by dark energy, therefore we focus our analysis on non-singular bouncing and cyclic cosmologies, in particular focusing on the possibility of closed models always having a bounce for any initial conditions. We analyse the range of dynamical behaviour admitted by the system, and find a class of closed models that admit a non-singular bounce, with early- and late-time accelerated expansion connected by a decelerating phase. In all cases, we find the bouncing models are only relevant when dark matter and radiation appear at a certain energy scale, and so require a period such as reheating. We then investigate imposing an upper bound on the dark matter and radiation, such that their energy densities cannot become infinite. We find that bounces are always the general closed model, and a class of models exist with early- and late-time acceleration, connected by a decelerating phase. We also consider parameter values for the dark energy component, such that the discrepancy between the observed value of and the theoretical estimates of the contributions to the effective cosmological constant expected from quantum field theory would be explained. However, we find that the class of models left does not allow for an early- and late-time accelerated expansion, connected by a decelerating period where large-scale structure could form. Nonetheless, our qualitative analysis serves as a basis for the construction of more realistic models with realistic quantitative behaviour.
arXiv comment26 pages, 21 figures. Updated version to reflect changes made for publication
References in corpus (32)
- Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
- Measurements of Omega and Lambda from 42 High-Redshift Supernovae
- Planck 2018 results. I. Overview and the cosmological legacy of Planck
- The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang
- The Einstein Equations on the 3-Brane World
- Pre-Big-Bang in String Cosmology
- Brane-World Gravity
- Cosmic Evolution in a Cyclic Universe
- Purely kinetic k-essence as unified dark matter
- Bouncing Cosmologies: Progress and Problems
- A Critical Review of Classical Bouncing Cosmologies
- Pyrotechnic Universe
- The Effective Field Theory of nonsingular cosmology
- A new kind of cyclic universe
- On the Hamiltonian Constraint of Loop Quantum Cosmology
- Bouncing Cosmology made simple
- Cosmo-dynamics and dark energy with non-linear equation of state: a quadratic model
- A covariant Lagrangian for stable nonsingular bounce
- Cosmological perturbations in the bulk and on the brane
- The Einstein static universe in Loop Quantum Cosmology
- Brane-world generalizations of the Einstein static universe
- Inhomogeneous vacuum energy
- DHOST Bounce
- Challenges for Kinetic Unified Dark Matter
- Cosmo-dynamics and dark energy with a quadratic EoS: anisotropic models, large-scale perturbations and cosmological singularities
- Nonsingular bouncing cosmology in general relativity: physical analysis of the spacetime defect
- The mystery of the cosmic vacuum energy density and the accelerated expansion of the Universe
- Bouncing models with a cosmological constant
- Cosmology in a brane-universe
- Nonsingular Cosmology from an Interacting Vacuum
- Quasi-isotropic cycles and non-singular bounces in a Mixmaster cosmology
- Bouncing Model in Brane World Theory