Cyclic Inflation
arXiv:0812.3182 · doi:10.1103/PhysRevD.80.043511
Abstract
We present an inflationary model that is geodesically complete and does not suffer from the transplanckian problem. In most inflationary models, massless (conformal) scalar field fluctuations in a deSitter background gives rise to a scale-invariant spectrum. In this work, we realize scale invariant perturbations from thermal fluctuations in (conformal) radiation during a radiation dominated contraction era prior to inflation. As the modes exit the Hubble radius during the contraction phase, scale invariant fluctuations are indeed generated. After many cycles, we enter into a power-law inflationary phase, that stretches the modes produced in the previous contraction phase to scales that we observe today.
15 pages, 2 figures
References in corpus (18)
- New Ekpyrotic Cosmology
- Loop quantum cosmology of k=1 FRW models
- Generating Ekpyrotic Curvature Perturbations Before the Big Bang
- Cosmology without inflation
- On Perturbations of Quintom Bounce
- Evolution of Metric Perturbations in Quintom Bounce model
- A classical bounce: constraints and consequences
- Inflation and Brane Gases
- Cyclic Universes from General Collisionless Braneworld Models
- The Ups and Downs of Cyclic Universes
- The cosmological BCS mechanism and the Big Bang Singularity
- Entropy of Contracting Universe in Cyclic Cosmology
- Towards A Nonsingular Tachyonic Big Crunch
- Perturbations in a regular bouncing Universe
- String Gas Cosmology and Structure Formation - A Brief Review
- Emergence of Fluctuations from a Tachyonic Big Bang
- Large Radius Hagedorn Regime in String Gas Cosmology
- Adiabatic fluctuations from cosmic strings in a contracting universe