Adiabatic CMB perturbations in pre-Big-Bang string cosmology

2001/09/30 by Kari Enqvist, Martin S. Sloth · 880 citations
Physics and Astronomy · #Adiabatic process #Astrophysics #Axion #Big Bang (financial markets) #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Inflation (cosmology) #Instanton #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum electrodynamics #Quantum mechanics #String (physics) #Theoretical physics #Universe #astro-ph #hep-ph #hep-th

paper · pdf · doi:10.1016/s0550-3213(02)00043-3

published in Nuclear Physics B 626(1-2), 395-409 (Elsevier BV) · 15 pages, 1 figure; Version to appear in Nucl.Phys.B. Figure improved, discussion and one reference added

arxiv created 2002/01/30 · openalex publication_date 2002/04/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

We consider the pre-big bang scenario with a massive axion field which starts to dominate energy density when oscillating in an instanton-induced potential and subsequently reheats the universe as it decays into photons, thus creating adiabatic CMB perturbations. We find that the fluctuations in the axion field can give rise to a nearly flat spectrum of adiabatic perturbations with a spectral tilt Δn in the range -0.1 \lesssim Δn \lesssim 1.

Citations

• Vacuum fluctuations in axion-dilaton cosmologies
• INFLATION, DEFLATION, AND FRAME-INDEPENDENCE IN STRING COSMOLOGY
• The cosmology of string theoretic axions
• Graceful exit and energy conditions in string cosmology

Cited by

• Conformal frame dependence of inflation
• Non-gaussian mode coupling and the statistical cosmological principle
• A general solution for scalar perturbations in bouncing cosmologies
• Shape of high order correlation functions in CMB anisotropy maps
• Multi-disformal invariance of non-linear primordial perturbations
• On the initial regime of pre-big bang cosmology
• Candidates for the inflaton in quiver gauge theory
• CMB spectral distortions in generic two-field models
• The running curvaton *
• On classification of models of large local-type non-Gaussianity
• Conserved cosmological perturbations
• Non-Gaussianity in curvaton models with nearly quadratic potentials
• Testing primordial non-Gaussianity in CMB anisotropies
• Primordial black holes from a curvaton: the role of bimodal distributions
• Evading the Lyth bound in hybrid natural inflation