Evolution of Fluctuations during Graceful Exit in String Cosmology

Abstract

We study the evolution of fluctuations in a universe dominated by a scalar field coupled to the Gauss-Bonnet term. During the graceful exit, we found non-negligible enhancements of both curvature perturbation and gravitational wave in the long wavelength limit, and we also found a short wavelength instability for steep background superinflation just after the completion of the graceful exit. This result for one possible graceful exit mechanism would provide a significant implication on the primordial spectrum from the string cos mology.

5 pages, 5 figures, Revtex, to appear in Phys. Lett. B

References in corpus (3)

• Instability of 1-loop superstring cosmology
• Duality in cosmological perturbation theory
• Conserved cosmological structures in the one-loop superstring effective action

Cited by in corpus (76)

• The Pre-Big Bang Scenario in String Cosmology
• Effective Field Theory for Inflation
• Superstring Cosmology
• Construction of cosmologically viable f(G) gravity models
• Circular Polarization of Primordial Gravitational Waves in String-inspired Inflationary Cosmology
• Gauss-Bonnet Quintessence: Background Evolution, Large Scale Structure and Cosmological Constraints
• On the Construction of Nonsingular Pre-Big-Bang and Ekpyrotic Cosmologies and the Resulting Density Perturbations
• Solar system constraints on f(G) gravity models
• Slow-roll inflation with a Gauss-Bonnet correction
• Higher Curvature Corrections to Primordial Fluctuations in Slow-roll Inflation
• Power spectra from an inflaton coupled to the Gauss-Bonnet term
• Viable Inflation in Scalar-Gauss-Bonnet Gravity and Reconstruction from Observational Indices
• Evolution of cosmological perturbations in non-singular string cosmologies
• Newtonian limit of nonlocal cosmology
• Inflation coupled to a Gauss-Bonnet term
• Lorentz Violating Inflation
• Observational constraints on slow-roll inflation coupled to a Gauss-Bonnet term
• Inflation with Gauss-Bonnet coupling
• Inflationary Phenomenology of Einstein Gauss-Bonnet Gravity Compatible with GW170817
• Inflation driven by Einstein-Gauss-Bonnet gravity
• Cosmological perturbations across a curvature bounce
• Density perturbations in the Ekpyrotic Universe and string-inspired generalizations
• No-Go Theorem for Gauss-Bonnet Inflation without Inflaton Potential
• Bounce universe from string-inspired Gauss-Bonnet gravity
• Non-Minimally Coupled Einstein Gauss Bonnet Inflation Phenomenology in View of GW170817
• Inflation with a quartic potential in the framework of Einstein-Gauss-Bonnet gravity
• Slow-roll Inflation with the Gauss-Bonnet and Chern-Simons Corrections
• Linear growth of structure in massive bigravity
• Gauss-Bonnet Chern-Simons gravitational wave leptogenesis
• Inflation in string-inspired cosmology and suppression of CMB low multipoles
• Reheating in Gauss-Bonnet-coupled inflation
• Primordial black holes and scalar induced gravitational waves from the $E$ model with a Gauss-Bonnet term
• Higgs Inflation with a Gauss-Bonnet term in the Jordan Frame
• Propagating speed of primordial gravitational waves and inflation
• Propagating Speed of Primordial Gravitational Waves
• De Sitter solutions in Einstein-Gauss-Bonnet gravity
• Reviving non-Minimal Horndeski-like Theories after GW170817: Kinetic Coupling Corrected Einstein-Gauss-Bonnet Inflation
• Is there an effect of a nontrivial $c_T$ during inflation?
• Realizing Scale-invariant Density Perturbations in Low-energy Effective String Theory
• Stability analysis of de Sitter solutions in models with the Gauss-Bonnet term
• Nature of singularities in anisotropic string cosmology
• Pathologies in Lovelock AdS Black Branes and AdS/CFT
• A Nearly Massless Graviton in Einstein-Gauss-Bonnet Inflation with Linear Coupling Implies Constant-roll for the Scalar Field
• CMB from a Gauss-Bonnet-induced de Sitter fixed point
• Pleasant behavior of swampland conjectures in the face of specific inflationary models
• Cosmological perturbations in Gauss-Bonnet quasi-dilaton massive gravity
• Primordial Spectra of slow-roll inflation at second-order with the Gauss-Bonnet correction
• Noether symmetry for Gauss-Bonnet dilatonic gravity
• Gauss-Bonnet Term on Vacuum Decay
• Gravitational waves in non-singular string cosmologies
• Slow-Roll Inflation with Exponential Potential in Scalar-Tensor Models
• Transient Crossing of Phantom divide line $w_{\Lambda }=-1$ under Gauss-Bonnet interaction
• Casimir Dark Energy, Stabilization of the Extra Dimensions and Gauss-Bonnet Term
• New slow-roll approximations for inflation in Einstein-Gauss-Bonnet gravity
• Dressed Power-law Inflation with Cuscuton
• Slow-Roll Inflation in Scalar-Tensor Models
• Constraining scalar-Gauss-Bonnet Inflation by Reheating, Unitarity and PLANCK
• Fermion production from preheating-amplified metric perturbations
• Gauss-Bonnet Dark Energy and the Speed of Gravitational Waves
• Collapsing spherical star in Scalar-Einstein-Gauss-Bonnet gravity with a quadratic coupling
• Gravitational Waves in Chern-Simons-Gauss-Bonnet Gravity
• A new approach to exact solutions construction in scalar cosmology with a Gauss-Bonnet term
• Massive fermion production in nonsingular superstring cosmology
• Swampland Criteria and Constraints on Inflation in a $f(R,T)$ Gravity Theory
• History of cosmic evolution with modified Gauss-Bonnet-dilatonic coupled term
• Inflationary Dynamics of Mutated Hilltop Inflation in Einstein-Gauss-Bonnet Gravity Under New Slow-Roll Approximations with Generalised Reheating
• Multifluid cosmology in f (G) gravity
• Inflationary Dynamics in Einstein-Gauss-Bonnet Gravity Using New Slow-Roll Approximations considering Generalised Reheating
• Birth of de Sitter Universe from time crystal
• Inflation with Gauss-Bonnet and Chern-Simons higher-curvature-corrections in the view of GW170817
• Noncommutative quantum mechanics of simple matter systems interacting with circularly polarized gravitational waves
• Constraining Modified Gravity with Large non-Gaussianities
• Primordial blackholes from Gauss-Bonnet-corrected single field inflation
• Gauss-Bonnet-induced symmetry breaking/restoration during inflation
• Sound Speed Resonance of Gravitational Waves in Gauss-Bonnet-coupled inflation
• $f(R,\mathcal{G})$-cosmological dynamics in the FLRW background