On the initial regime of pre-big bang cosmology
arXiv:1707.05763 · doi:10.1088/1475-7516/2017/09/001
Abstract
The production of a background of super-horizon curvature perturbations with the appropriate (red) spectrum needed to trigger the cosmic anisotropies observed on large scales is associated, in the context of pre-big bang inflation, with a phase of growing string coupling. The extension towards the past of such a phase is not limited in time by the dynamical backreaction of the quantum perturbations of the cosmological geometry and of its sources. A viable, slightly red spectrum of scalar perturbations can thus be the output of an asymptotic, perturbative regime which is well compatible with an initial string-vacuum state satisfying the postulate of "Asymptotic Past Triviality".
arXiv comment9 pages, no figures, a few typos corrected. Published in JCAP 09 (2017) 001
References in corpus (18)
- Planck 2015 results. XIII. Cosmological parameters
- Generating the curvature perturbation without an inflaton
- Pre-Big-Bang in String Cosmology
- The Pre-Big Bang Scenario in String Cosmology
- Adiabatic CMB perturbations in pre-big bang string cosmology
- Effects of Cosmological Moduli Fields on Cosmic Microwave Background
- Magnetic fields from inflation?
- Towards a non-singular pre-big bang cosmology
- Dilaton Production in String Cosmology
- Metric Perturbations in Dilaton-Driven Inflation
- Vacuum fluctuations in axion-dilaton cosmologies
- Pre-big bang bubbles from the gravitational instability of generic string vacua
- S-duality Invariant Perturbations in String Cosmology
- Critical Number of Fields in Stochastic Inflation
- Assisting pre-big bang phenomenology through short-lived axions
- Constraints on pre-big bang parameter space from CMBR anisotropies
- Observable gravitational waves in pre-big bang cosmology: an update
- Constraints on the production of primordial magnetic seeds in pre-big bang cosmology