Cosmic eggs to relax the cosmological constant
arXiv:2101.01437 · doi:10.1088/1475-7516/2021/08/064
Abstract
In theories with extra dimensions, the cosmological hierarchy problem can be thought of as the unnaturally large radius of the observable universe in Kaluza-Klein units. We sketch a dynamical mechanism that relaxes this. In the early universe scenario we propose, three large spatial dimensions arise through tunneling from a 'cosmic egg', an effectively one-dimensional configuration with all spatial dimensions compact and of comparable, small size. If the string landscape is dominated by low-dimensional compactifications, cosmic eggs would be natural initial conditions for cosmology. A quantum cosmological treatment of a toy model egg predicts that, in a variant of the Hartle-Hawking state, cosmic eggs break to form higher dimensional universes with a small, but positive cosmological constant or quintessence energy. Hence cosmic egg cosmology yields a scenario in which the seemingly unnaturally small observed value of the vacuum energy can arise from natural initial conditions.
arXiv comment11 pages, 4 figures, 1 appendix
References in corpus (48)
- Cosmological Imprint of an Energy Component with General Equation of State
- de Sitter Vacua in String Theory
- Hierarchies from Fluxes in String Compactifications
- Supergravity description of field theories on curved manifolds and a no go theorem
- Systematics of Moduli Stabilisation in Calabi-Yau Flux Compactifications
- M Theory, Orientifolds and G-Flux
- Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)
- Quintessence: A Review
- On the Cosmological Implications of the String Swampland
- Type IIA Moduli Stabilization
- What if string theory has no de Sitter vacua?
- On the possible running of the cosmological "constant"
- The scaling evolution of cosmological constant
- Lorentzian Quantum Cosmology
- The Classical Universes of the No-Boundary Quantum State
- Expanding (3+1)-dimensional universe from a Lorentzian matrix model for superstring theory in (9+1)-dimensions
- The No-Boundary Measure of the Universe
- De Sitter vs Quintessence in String Theory
- No smooth beginning for spacetime
- Lectures on the Cosmological Constant Problem
- No Rescue for the No Boundary Proposal
- The Real No-Boundary Wave Function in Lorentzian Quantum Cosmology
- Quantum Horizons of the Standard Model Landscape
- Remarks on scale separation in flux vacua
- A comment on effective field theories of flux vacua
- Populating the Landscape: A Top Down Approach
- Damped perturbations in the no-boundary state
- F-theory and Dark Energy
- Pixelated Dark Energy
- What is the No-Boundary Wave Function of the Universe?
- Brane/antibrane dynamics and KKLT stability
- Local Observation in Eternal inflation
- No-scale and scale-separated flux vacua from IIA on G2 orientifolds
- The -term Problem and other Challenges of Stringy Quintessence
- Loops rescue the no-boundary proposal
- The no-boundary proposal in biaxial Bianchi IX minisuperspace
- Predicting a Prior for Planck
- Anthropic Bounds on Lambda from the No-Boundary Quantum State
- Inconsistencies from a Running Cosmological Constant
- Cosmological Constant Problem and Renormalized Vacuum Energy Density in Curved Background
- M-theory on Calabi-Yau Five-Folds
- Renormalization-scale independence of the physical cosmological constant
- On three dimensions as the preferred dimensionality of space via the Brandenberger-Vafa mechanism
- Dynamical Decompactification and Three Large Dimensions
- On the Running of the Cosmological Constant in Quantum General Relativity
- Running of the Cosmological Constant and Estimate of its Value in Quantum General Relativity
- What if? - Exploring the Multiverse through Euclidean wormholes
- M-theory Calabi-Yau Quantum Mechanics