Large extra dimensions from higher-dimensional inflation

Abstract

We propose the possibility that compact extra dimensions can obtain large size by higher dimensional inflation, relating the weakness of the actual gravitational force to the size of the observable universe. Solution to the horizon problem implies that the fundamental scale of gravity is smaller than $10^{13}$ GeV which can be realised in a braneworld framework for any number of extra dimensions. However, requirement of (approximate) flat power spectrum of primordial density fluctuations consistent with present observations makes this simple proposal possible only for one extra dimension at around the micron scale. After the end of five-dimensional inflation, the radion modulus can be stabilised at a vacuum with positive energy of the order of the present dark energy scale. An attractive possibility is based on the contribution to the Casimir energy of right-handed neutrinos with a mass at a similar scale.

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References in corpus (7)

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Cited by in corpus (15)

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• Investigating the Origin of CMB Large-Scale Features Using LiteBIRD and CMB-S4
• Role of internal space correlations in the dynamics of a higher-dimensional Bianchi type-I universe: shear scalar and Hubble parameter perspectives
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Primordial Power Spectrum of Five Dimensional Uniform Inflation
• Thin-wall vacuum decay in the presence of a compact dimension
• Exploring Cosmological Implications of the Modified Raychaudhuri Equation in Non-Gravitating Vacuum Energy Theory
• Multidimensional arrow of time
• Discrete Spacetime Theories Can Explain the Muon Magnetic Moment Discrepancy
• Choice of Quantum Vacuum for Inflation Observables
• Curvature-Assisted Dynamical Compactification in a Pre-Inflationary Higher-Dimensional Universe