2002/12/08 by V. Bozza, M. Gasperini, Massimo Giovannini +2 · 38 citations
Physics and Astronomy · #Adiabatic process #Anisotropy #Axion #Big Bang (financial markets) #Black Holes and Theoretical Physics #Compactification (mathematics) #Cosmic microwave background #Cosmic string #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Extra dimensions #Inflation (cosmology) #Parameter space #Particle physics #Physics #Quantum mechanics #Scalar (mathematics) #Statistical physics #String (physics) #Superstring theory #Supersymmetry #Theoretical physics #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.67.063514
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 67(6) (American Physical Society) · 63 pages in Latex style with 14 figures included
arxiv created 2002/12/08 · openalex publication_date 2003/03/26 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The so-called curvaton mechanism---a way to convert isocurvature perturbations into adiabatic ones---is investigated both analytically and numerically in a pre-big-bang scenario where the role of the curvaton is played by a sufficiently massive Kalb-Ramond axion of superstring theory. When combined with observations of CMBR anisotropies at large and moderate angular scales, the present analysis allows us to constrain quite considerably the parameter space of the model: in particular, the initial displacement of the axion from the minimum of its potential and the rate of evolution of the compactification volume during pre-big-bang inflation. The combination of theoretical and experimental constraints favors a slightly blue spectrum of scalar perturbations, and/or a value of the string scale in the vicinity of the SUSY GUT scale.