2017/07/31 by M. Gasperini · 7 citations
Physics and Astronomy · #Big Bang (financial markets) #Big Bounce #Black Holes and Theoretical Physics #Context (archaeology) #Cosmic string #Cosmological perturbation theory #Cosmology #Cosmology and Gravitation Theories #Curvature #Non-Gaussianity #Noncommutative and Quantum Gravity Theories #Quantum cosmology #Scalar (mathematics) #String (physics) #gr-qc #hep-th
paper · pdf · doi:10.1088/1475-7516/2017/09/001
published in Journal of Cosmology and Astroparticle Physics 2017(09), 001 (Institute of Physics) · 9 pages, no figures, a few typos corrected. Published in JCAP 09 (2017) 001
openalex created_date 2017/07/31 · openalex publication_date 2017/09/01 · arxiv created 2017/09/07 · arxiv updated 2017/09/08 · openalex updated_date 2026/08/05
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".