Past incompleteness of a bouncing multiverse
arXiv:1403.1599 · doi:10.1088/1475-7516/2014/06/034
Abstract
According to classical GR, Anti-de Sitter (AdS) bubbles in the multiverse terminate in big crunch singularities. It has been conjectured, however, that the fundamental theory may resolve these singularities and replace them by nonsingular bounces. This may have important implications for the beginning of the multiverse. Geodesics in cosmological spacetimes are known to be past-incomplete, as long as the average expansion rate along the geodesic is positive, but it is not clear that the latter condition is satisfied if the geodesic repeatedly passes through crunching AdS bubbles. We investigate this issue in a simple multiverse model, where the spacetime consists of a patchwork of FRW regions. The conclusion is that the spacetime is still past-incomplete, even in the presence of AdS bounces.
arXiv comment26 pages,5 figures
References in corpus (27)
- The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang
- Quantization of Four-form Fluxes and Dynamical Neutralization of the Cosmological Constant
- Loop Quantum Cosmology: A Status Report
- The Pre-Big Bang Scenario in String Cosmology
- Cosmic Evolution in a Cyclic Universe
- The Anthropic Landscape of String Theory
- A Cyclic Model of the Universe
- Inflationary spacetimes are not past-complete
- Starting the Universe: Stable Violation of the Null Energy Condition and Non-standard Cosmologies
- The Emergent Universe: inflationary cosmology with no singularity
- Towards a Nonsingular Bouncing Cosmology
- The Emergent Universe: An Explicit Construction
- G-Bounce
- An emergent universe from a loop
- Primordial perturbations in a non singular bouncing universe model
- Cosmological perturbations through a simple bounce
- A Matter Bounce By Means of Ghost Condensation
- Quantum nature of cosmological bounces
- Quantum Tunneling in Flux Compactifications
- Can Universe Experience Many Cycles with Different Vacua ?
- Nonperturbative analysis of the evolution of cosmological perturbations through a nonsingular bounce
- A New Mechanism for Bubble Nucleation: Classical Transitions
- Collapse of simple harmonic universe
- Probability Distribution for in Open-universe Inflation
- Instability of an emergent universe
- Non-singular bounce transitions in the multiverse
- Non-singular AdS-dS transitions in a landscape scenario