CMB anisotropies from pre-big bang cosmology

Abstract

We present an alternative scenario for cosmic structure formation where initial fluctuations are due to Kalb-Ramond axions produced during a pre-big bang phase of inflation. We investigate whether this scenario, where the fluctuations are induced by seeds and therefore are of isocurvature nature, can be brought in agreement with present observations by a suitable choice of cosmological parameters. We also discuss several observational signatures which can distinguish axion seeds from standard inflationary models. We finally discuss the gravitational wave background induced in this model and we show that it may be well within the range of future observations.

33 pages, 18 figures, corrected some typos

References in corpus (59)

• Discovery of a Supernova Explosion at Half the Age of the Universe and its Cosmological Implications
• A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation
• MAXIMA-1: A Measurement of the Cosmic Microwave Background Anisotropy on angular scales of 10 arcminutes to 5 degrees
• Using the Evolution of Clusters to Constrain Omega
• Gravitational Wave Experiments and Early Universe Cosmology
• Pre-Big-Bang in String Cosmology
• Reconstructing the linear power spectrum of cosmological mass fluctuations
• Angular Resolution of the LISA Gravitational Wave Detector
• Superstring Cosmology
• Elements of String Cosmology
• A Measurement of the Angular Power Spectrum of the CMB from l = 100 to 400
• Cosmic Confusion: Degeneracies among Cosmological Parameters Derived from Measurements of Microwave Background Anisotropies
• Towards a non-singular pre-big bang cosmology
• Relic Gravitational Waves from String Cosmology
• Cosmic Temperature Fluctuations from Two Years of COBE DMR Observations
• The Graceful Exit Problem in String Cosmology
• Duality and Dilaton
• Twisting Classical Solutions in Heterotic String Theory
• Inflation Deflation and Frame-Independence in String Cosmology
• A measurement of Omega from the North American test flight of BOOMERANG
• Dilaton Production in String Cosmology
• $O(d,d)$-Covariant String Cosmology
• Manifestly $O(d,d)$ Invariant Approach to Space-Time Dependent String Vacua
• A Model of Graceful Exit in String Cosmology
• Metric Perturbations in Dilaton-Driven Inflation
• Vacuum fluctuations in axion-dilaton cosmologies
• Towards a Singularity-Free Inflationary Universe?
• Measurement of a Peak in the Cosmic Microwave Background Power Spectrum from the North American test flight of BOOMERANG
• One-Loop Superstring Cosmology and the Non-Singular Universe
• Tree-level String Cosmology
• Graceful exit in quantum string cosmology
• Spectrum of relic gravitational waves in string cosmology
• Dilaton Contributions to the Cosmic Gravitational Wave Background
• Dark Energy and the CMB
• New CMB constraints on the cosmic matter budget: trouble for nucleosynthesis?
• The graceful exit in pre-big bang string cosmology
• Cosmic Microwave Background Anisotropies from Scaling Seeds: Global Defect Models
• Graceful Exit and Energy Conditions in String Cosmology
• Inhomogeneous Pre-Big Bang String Cosmology
• Pre-Big-Bang Inflation Requires Fine Tuning
• Distinguishing Causal Seeds from Inflation
• Back Reaction and Graceful Exit in String Inflationary Cosmology
• Axions and the Graceful Exit Problem in String Cosmology
• Characterizing the Peak in the CMB Angular Power Spectrum
• Tensor perturbations in high-curvature string backgrounds
• S-duality Invariant Perturbations in String Cosmology
• Duality in cosmological perturbation theory
• Quantum Inhomogeneities in String Cosmology
• Pre-Big-Bang Requires the Universe to be Exponentially Large From the Very Beginning
• Classical Inhomogeneities in String Cosmology
• Seeds of large-scale anisotropy in string cosmology
• The structure of Doppler peaks induced by active perturbations
• Causality and the Doppler Peaks
• Singularity and exit problems in two-dimensional string cosmology
• Massless (pseudo-)scalar seeds of CMB anisotropy
• Microwave Background Anisotropies from Scaling Seed Perturbations
• Cosmic Microwave Background anisotropies and extra dimensions in String Cosmology
• Particle production in string cosmology models
• The fine tuning problem in pre-big-bang inflation

Cited by in corpus (13)

• Generating the curvature perturbation without an inflaton
• The Pre-Big Bang Scenario in String Cosmology
• Adiabatic CMB perturbations in pre-big bang string cosmology
• Direct detection of the inflationary gravitational wave background
• Adiabatic perturbations in pre big bang models: matching conditions and scale invariance
• Assisting pre-big bang phenomenology through short-lived axions
• Open and closed CDM isocurvature models contrasted with the CMB data
• Constraints on pre-big bang parameter space from CMBR anisotropies
• Constraints on scalar and tensor perturbations in phenomenological and two-field inflation models: Bayesian evidences for primordial isocurvature and tensor modes
• The cosmology of the nonsymmetric theory of gravitation
• String-inspired cosmology
• Inertial mechanism: dynamical mass as a source of particle creation
• Massive fermion production in nonsingular superstring cosmology