Dark Energy and the Return of the Phoenix Universe
arXiv:0812.3388 · doi:10.1103/PhysRevD.79.063503
Abstract
In cyclic universe models based on a single scalar field (e.g., the radion determining the distance between branes in M-theory), virtually the entire universe makes it through the ekpyrotic smoothing and flattening phase, bounces, and enters a new epoch of expansion and cooling. This stable evolution cannot occur, however, if scale-invariant curvature perturbations are produced by the entropic mechanism because it requires two scalar fields (e.g., the radion and the Calabi-Yau dilaton) evolving along an unstable classical trajectory. In fact, we show here that an overwhelming fraction of the universe fails to make it through the ekpyrotic phase; nevertheless, a sufficient volume survives and cycling continues forever provided the dark energy phase of the cycle lasts long enough, of order a trillion years. Two consequences are a new role for dark energy and a global structure of the universe radically different from that of eternal inflation.
arXiv comment5 pages, 3 figures
References in corpus (31)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Heterotic and Type I String Dynamics from Eleven Dimensions
- Cosmic Evolution in a Cyclic Universe
- A Cyclic Model of the Universe
- On the Generation of a Scale-Invariant Spectrum of Adiabatic Fluctuations in Cosmological Models with a Contracting Phase
- Ekpyrotic and Cyclic Cosmology
- Kasner and Mixmaster behavior in universes with equation of state w \ge 1
- Designing Cyclic Universe Models
- Generating Ekpyrotic Curvature Perturbations Before the Big Bang
- The primordial curvature perturbation in the ekpyrotic Universe
- Primordial perturbations in a non singular bouncing universe model
- On the Spectrum of Fluctuations in an Effective Field Theory of the Ekpyrotic Universe
- Non-Gaussianities in New Ekpyrotic Cosmology
- Adiabatic perturbations in pre big bang models: matching conditions and scale invariance
- Cosmological Perturbations in a Big Crunch/Big Bang Space-time
- Non-Gaussian Density Fluctuations from Entropically Generated Curvature Perturbations in Ekpyrotic Models
- Perturbations in bouncing cosmologies: dynamical attractor vs scale invariance
- Non-Gaussianities from ekpyrotic collapse with multiple fields
- Cosmological structure problem of the ekpyrotic scenario
- The failure of cosmological perturbation theory in the new ekpyrotic and cyclic ekpyrotic scenarios
- Evolution to a smooth universe in an ekpyrotic contracting phase with w > 1
- Intuitive understanding of non-gaussianity in ekpyrotic and cyclic models
- Ekpyrotic collapse with multiple fields
- On the Initial Conditions in New Ekpyrotic Cosmology
- Cosmological perturbations and the transition from contraction to expansion
- Scale-invariance in expanding and contracting universes from two-field models
- Colliding Branes in Heterotic M-theory
- Cosmic Perturbations Through the Cyclic Ages
- Bouncing Negative-Tension Branes
- Effective Actions for Heterotic M-Theory
- Solution of a Braneworld Big Crunch/Big Bang Cosmology
Cited by in corpus (36)
- A Cosmological Super-Bounce
- Non-singular cosmology in a model of non-relativistic gravity
- Harrison--Zeldovich spectrum from conformal invariance
- Dark energy fifth forces in torsion pendulum experiments
- Supersymmetric Galileons
- Cosmic Bounces and Cyclic Universes
- Ekpyrotic Non-Gaussianity -- A Review
- Multifield Cosmological Perturbations at Third Order and the Ekpyrotic Trispectrum
- Note on the production of scale-invariant entropy perturbation in the Ekpyrotic universe
- A Safe Beginning for the Universe?
- Non-Gaussianity Generated by the Entropic Mechanism in Bouncing Cosmologies Made Simple
- Cycles in the Multiverse
- Running of the scalar spectral index in bouncing cosmologies
- On the Quantum-To-Classical Transition for Ekpyrotic Perturbations
- Bouncing Universe from Nothing
- Classical Inflationary and Ekpyrotic Universes in the No-Boundary Wavefunction
- Consistent Scalar and Tensor Perturbation Power Spectra in Single Fluid Matter Bounce with Dark Energy Era
- Cosmological consequences of a principle of finite amplitudes
- Anisotropic Pressures at Ultra-stiff Singularities and the Stability of Cyclic Universes
- On the No-Boundary Proposal for Ekpyrotic and Cyclic Cosmologies
- Converting entropy to curvature perturbations after a cosmic bounce
- Eternal Inflation With Non-Inflationary Pocket Universes
- Microphysical manifestations of viscosity and consequences for anisotropies in the very early universe
- Non-Singular Bounces Catalysed by Dark Energy
- The Return of the Phoenix Universe
- Quantum Circuit Complexity of Primordial Perturbations
- Design of a Cyclic Multiverse
- Amplification of Curvature Perturbations in Cyclic Cosmology
- The de Broglie-Bohm Quantum Theory and its Application to Quantum Cosmology
- Diversity in the Phoenix Universe
- Dynamical Selection of the Primordial Density Fluctuation Amplitude
- Strong Coupling Problem with Time-Varying Sound Speed
- Non-singular Cyclic Cosmology without Phantom Menace
- Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe
- Notes on the post-bounce background dynamics in bouncing cosmologies
- Bayes' Theorem, Inflation, and the Ekpyrotic Universe