A Galileon Design of Slow Expansion

Abstract

We show a model of the slow expansion, in which the scale invariant spectrum of curvature perturbation is adiabatically induced by its increasing mode, by applying a generalized Galileon field. In this model, initially ε<< -1, which then is rapidly increasing, during this period the universe is slowly expanding. There is not the ghost instability, the perturbation theory is healthy. When ε\sim -1, the slow expansion phase ends, and the available energy of field can be released and the universe reheats. This scenario might be a viable design of the early universe.

8 pages, 7 figures, minor changes and refs. added, published in PRD

References in corpus (28)

• Covariant Galileon
• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Imperfect Dark Energy from Kinetic Gravity Braiding
• Reheating in Inflationary Cosmology: Theory and Applications
• G-inflation: inflation driven by the Galileon field
• Galilean Genesis: an alternative to inflation
• Galileon Cosmology
• Bouncing Universe with Quintom Matter
• Galileon inflation
• Observational constraints on Galileon cosmology
• Primordial non-Gaussianity from the DBI Galileons
• Matter perturbations in Galileon cosmology
• Density perturbations in general modified gravitational theories
• Modified gravity a la Galileon: Late time cosmic acceleration and observational constraints
• Primordial non-Gaussianities in general modified gravitational models of inflation
• Primordial non-Gaussianity from G-inflation
• Generalized Brans-Dicke theories
• Oscillating universe with quintom matter
• Speedy sound and cosmic structure
• Near Scale Invariance with Modified Dispersion Relations
• Towards a Cosmological Dual to Inflation
• Seeding of Primordial Perturbations During a Decelerated Expansion
• Scale Invariance via a Phase of Slow Expansion
• On Primordial Density Perturbation and Decaying Speed of Sound
• Amplification of Curvature Perturbations in Cyclic Cosmology
• Primordial Perturbations During a Slow Expansion
• Non-Gaussianity in Island Cosmology
• Emergently Thermalized Islands in the Landscape

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