Bouncing Cosmology made simple

Abstract

We introduce the "wedge diagram," an intuitive way to illustrate how cosmological models with a classical (non-singular) bounce generically resolve fundamental problems in cosmology. These include the well-known horizon, flatness, and inhomogeneity problems; the small tensor-to-scalar ratio observed in the cosmic microwave background; the low entropy at the beginning of a hot, expanding phase; and the avoidance of quantum runaway. The same diagrammatic approach can be used to compare with other cosmological scenarios.

19 pages, 5 figures

References in corpus (19)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations
• Eternal inflation and its implications
• New Ekpyrotic Cosmology
• Exploring Bouncing Cosmologies with Cosmological Surveys
• Generating Ekpyrotic Curvature Perturbations Before the Big Bang
• The Effective Field Theory of nonsingular cosmology
• Why the cosmological constant is small and positive
• Non-Gaussianities in New Ekpyrotic Cosmology
• Stability of Geodesically Complete Cosmologies
• Evolution to a smooth universe in an ekpyrotic contracting phase with w > 1
• Cosmological bounce and Genesis beyond Horndeski
• A general mechanism for producing scale-invariant perturbations and small non-Gaussianity in ekpyrotic models
• Space-time slicing in Horndeski theories and its implications for non-singular bouncing solutions
• Bouncing Negative-Tension Branes
• Born Again Universe
• Fine-tuning challenges for the matter bounce scenario
• Spinor driven cosmic bounces and their cosmological perturbations
• Dynamical Selection of the Primordial Density Fluctuation Amplitude

Cited by in corpus (70)

• The Simons Observatory: Science goals and forecasts
• Single field inflation in the light of Pulsar Timing Array Data: Quintessential interpretation of blue tilted tensor spectrum through Non-Bunch Davies initial condition
• Matter Bounce Scenario in Extended Symmetric Teleparallel Gravity
• Bounce cosmology in generalized modified gravities
• Robustness of slow contraction to cosmic initial conditions
• Probing massless and massive gravitons via entanglement in a warped extra dimension
• Planck residuals anomaly as a fingerprint of alternative scenarios to inflation
• Nonsingular bouncing cosmology from general relativity
• The Simons Observatory: pipeline comparison and validation for large-scale B-modes
• Cosmographic analysis of a closed bouncing universe with the varying cosmological constant in $f(R,T)$ gravity
• Cosmological Time Crystal: Cyclic Universe with a small $\Lambda$ in a toy model approach
• Rapidly Descending Dark Energy and the End of Cosmic Expansion
• Decoherence out of fire: Purity loss in expanding and contracting universes
• More on the regularized big bang singularity
• CMB B-mode non-Gaussianity: optimal bispectrum estimator and Fisher forecasts
• Ultralocality and Slow Contraction
• Role of Extended Gravity Theory in Matter Bounce Dynamics
• Nonsingular bouncing cosmology from general relativity: Scalar metric perturbations
• Bouncing Cosmology in VCDM
• Generating cosmological perturbations in non-singular Horndeski cosmologies
• Stability of the Einstein static Universe in Einstein-Cartan-Brans-Dicke gravity
• Inflationary Dynamics and Particle Production in a Toroidal Bose-Einstein Condensate
• Sourcing curvature modes with entropy perturbations in non-singular bouncing cosmologies
• Explanatory Depth in Primordial Cosmology: A Comparative Study of Inflationary and Bouncing Paradigms
• Spherically symmetric black holes in the limiting curvature theory of gravity
• Diffuse emission from black hole remnants
• Nearly scale-invariant curvature modes from entropy perturbations during graceful exit
• A classical, non-singular, bouncing universe
• Cosmology using numerical relativity
• Model Independent Prediction of the Spectral Index of Primordial Quantum Fluctuations
• What Moves the Heavens Above?
• Quantum and classical cosmology in the Brans-Dicke theory
• Bouncing cosmology from nonlinear dark energy with two cosmological constants
• The Kalam Cosmological Argument Meets The Mentaculus
• Cosmological Inflation and Meta-Empirical Theory Assessment
• Non-Singular Bouncing Model in Energy Momentum Squared Gravity
• Causality and the Arrow of Time in the Branch-Cut Cosmology
• Parity violation in primordial tensor non-Gaussianities from matter bounce cosmology
• 4D Einstein-Gauss-Bonnet Gravity From Non-Einsteinian Phase
• Universal properties of the evolution of the Universe in modified loop quantum cosmology
• Banks-Zaks Cosmology, Inflation, and the Big Bang Singularity
• Interpreting Pulsar Timing Array data of Gravitational Waves with Ekpyrosis-Bouncing Cosmology
• A dynamical system analysis of bouncing cosmology with spatial curvature
• Bouncing cosmology in the limiting curvature theory of gravity
• Big Bounce or Double Bang? A Reply to Craig and Sinclair on the Interpretation of Bounce Cosmologies
• Big Bounce Baryogenesis
• Saving the universe with finite volume effects
• Holographic Signatures of Resolved Cosmological Singularities II: Numerical Investigations
• Novel modulus stabilization mechanism in higher dimensional f(R) Gravity
• Quantum Particle Production Effects on Cosmic Expansion
• Non-Singular Bouncing cosmology from Phantom Scalar-Gauss-Bonnet Coupling: Reconstruction with Observational Insights
• Cosmologies with turning points
• Warm and Cold Dark Matter in Bouncing Universe
• Spinning Toroidal Brane Cosmology; A Classical and Quantum Survey
• Dynamical system analysis in descending dark energy model
• Tunnelling-induced cosmic bounce in the presence of anisotropies
• Reconstructing inflationary potential from NANOGrav 15-year Data: A robust study using Non-Bunch Davies initial condition
• Bouncing and collapsing universes dual to late-time cosmological models
• Unruh-DeWitt Particle Detectors in Bouncing Cosmologies
• Constraining matter-bounce scenario from scalar-induced vector perturbations
• Power-Law Bounces in $f(R)$ Gravity: Analysis of the Ekpyrosis and Accelerating Regimes
• Gravitational Leptogenesis in Bounce Cosmology
• Is it possible to separate baryonic from dark matter within the $\Lambda$-CDM formalism?
• Unifying turnaround-bounce cosmology in a cyclic universe considering a running vacuum model
• Probability of the Initial Conditions for Inflation and Slow Contraction
• Topological Big Bangs: Reflection, Itty-Bitty Blenders, and Eternal Trumpets
• Kinetically-driven ekpyrosis
• Nonsingular solutions to the Einstein equations on piecewise-Lorentzian manifolds
• Crunching, Bouncing, and Cyclical Cosmologies from Dark Sector Interactions
• Time Dependent String Compactification: Towards Bouncing Cosmology