Pre-Big-Bang Inflation Requires Fine Tuning

Abstract

The pre-big-bang cosmology inspired by superstring theories has been suggested as an alternative to slow-roll inflation. We analyze, in both the Jordan and Einstein frames, the effect of spatial curvature on this scenario and show that too much curvature --- of either sign --- reduces the duration of the inflationary era to such an extent that the flatness and horizon problems are not solved. Hence, a fine-tuning of initial conditions is required to obtain enough inflation to solve the cosmological problems.

13 pages, Latex, 3 figures included

References in corpus (1)

• Inhomogeneous Pre-Big Bang String Cosmology

Cited by in corpus (56)

• The Pre-Big Bang Scenario in String Cosmology
• Probing Dark Energy with Baryonic Acoustic Oscillations from Future Large Galaxy Redshift Surveys
• Superstring Cosmology
• Lectures on string/brane cosmology
• Instability of 1-loop superstring cosmology
• The $H_0$ tension in light of vacuum dynamics in the Universe
• Cosmological perturbations through a simple bounce
• Pre-bangian origin of our entropy and time arrow
• Conformal-Frame (In)dependence of Cosmological Observations in Scalar-Tensor Theory
• Black holes from high-energy beam--beam collisions
• Loop corrections and graceful exit in string cosmology
• Pre-big bang bubbles from the gravitational instability of generic string vacua
• Topological $R^4$ Inflation
• Pre-Big-Bang Requires the Universe to be Exponentially Large From the Very Beginning
• String theoretic axion coupling and the evolution of cosmic structures
• Seeds of large-scale anisotropy in string cosmology
• Classical Inhomogeneities in String Cosmology
• Variable Equation of State for Generalized Dark Energy Model
• Inflationary Theory versus Ekpyrotic/Cyclic Scenario
• Particle production in string cosmology models
• Cos(M)ological Solutions in M- and String Theory
• Exploring hints for dark energy density evolution in light of recent data
• Quantum Cosmic No-Hair Theorem and Inflation
• The fine tuning problem in pre-big-bang inflation
• String-inspired cosmology
• Effects of anisotropy and spatial curvature on the pre-big bang scenario
• TASI Lectures: Cosmology for String Theorists
• Regular Cosmological Examples of Tree-Level Dilaton-Driven Models
• Qualitative Analysis of String Cosmologies
• Inhomogeneous Einstein-Rosen String Cosmology
• Inflation and initial conditions in the pre-big bang scenario
• The Confining Heterotic Brane Gas: A Non-Inflationary Solution to the Entropy and Horizon Problems of Standard Cosmology
• Phase space analysis of the bouncing universe with stringy effects
• CMB anisotropies from pre-big bang cosmology
• Initial Conditions in String Cosmology
• Back-Reaction to Dilaton-Driven Inflation
• Quantum Fluctuations in Open Pre-Big Bang Cosmology
• Expanding Universe: slowdown or speedup?
• Can the Type-IIB axion prevent Pre-big Bang inflation?
• Anisotropic Four-Dimensional NS-NS String Cosmology
• Singularity free dilaton-driven cosmologies and pre-little-bang
• Deviation From ΛCDM With Cosmic Strings Networks
• String Cosmology
• Numerical Study of Inhomogeneous Pre-Big-Bang Inflationary Cosmology
• A note on inflationary string cosmology
• String Cosmology: The Pre-Big Bang Scenario
• Cold and Hot Dark Matter from a Single Nonthermal Relic
• Anisotropic String Cosmology at Large Curvatures
• Entropy generation and inflation in wave collision induced pre-big-bang cosmology
• The fate of classical tensor inhomogeneities in pre-big-bang string cosmology
• Non-Abelian T-duality in Pre-Big-Bang Cosmology
• Evolving Maximally Symmetric Spacetime Bubbles from Spontaneous Z_2-Violation at Electroweak Symmetry Breaking Scale
• Hamilton-Jacobi approach to pre-big bang cosmology and the problem of initial conditions
• Density Perturbations in String Cosmology
• Revisiting Barrow's Graduated Inflationary Universe: A Warm perspective
• Isotropic evolution of a JBD anisotropic Bianchi universe