Detailed analysis of the curvature bounce: background dynamics and imprints in the CMB
arXiv:2206.09632 · doi:10.1140/epjc/s10052-022-10745-8
Abstract
If the spatial sections of the Universe are positively curved, extrapolating the inflationary stage backward in time inevitably leads to a classical bounce. This simple scenario, non-singular and free of exotic physics, deserves to be investigated in details. The background dynamics exhibits interesting features and is shown to be mostly insensitive to initial conditions as long as observational consequences are considered. The primordial scalar power spectrum is explicitly computed, for different inflaton potentials, and the subsequent CMB temperature anisotropies are calculated. The results are compatible with current measurements. Some deviations with respect to the standard paradigm can however appear at large scales and we carefully disentangle what is associated with the vacuum choice with what is more fundamentally due to the bounce itself.
References in corpus (23)
- Efficient Computation of CMB anisotropies in closed FRW models
- The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang
- Loop Quantum Cosmology: A Status Report
- Encyclopaedia Inflationaris
- Planck evidence for a closed Universe and a possible crisis for cosmology
- Bouncing Cosmologies: Progress and Problems
- A Quantum Gravity Extension of the Inflationary Scenario
- Eppur è piatto? The cosmic chronometer take on spatial curvature and cosmic concordance
- Non-parametric spatial curvature inference using late-universe cosmological probes
- The galaxy power spectrum take on spatial curvature and cosmic concordance
- Using the tilted flat-CDM and the untilted non-flat CDM inflation models to measure cosmological parameters from a compilation of observational data
- WMAP data and the curvature of space
- Inflation after Planck: Judgment Day
- Comparison of primordial tensor power spectra from the deformed algebra and dressed metric approaches in loop quantum cosmology
- On the "Causality Argument" in Bouncing Cosmologies
- Primordial scalar power spectrum from the Euclidean Big Bounce
- Inflation in the closed FLRW model and the CMB
- Bouncing Universe from Nothing
- Contamination cannot explain the lack of large-scale power in the cosmic microwave background radiation
- Tensor perturbations during inflation in a spatially closed Universe
- A pure general relativistic non-singular bouncing origin for the Universe
- On the perturbation theory in spatially closed background
- Curvature bounce in general relativity: background and primordial spectrum