Pre-inflationary primordial perturbations

Abstract

The large-scale power deficit in the cosmic microwave background fluctuations might be relevant with the physics of pre-inflation, a bounce, or a superinflationary phase preceding slow-roll inflation, which can provide a singular-free realization of inflation. We investigate the primordial perturbations from such pre-inflationary evolutions, which generally may consist of multiple phases with different background dynamics, and give a universal formula for the power spectrum of primordial perturbations in terms of the recursive Bogoliubov coefficients. We also apply our formula to corresponding cases and show how the intensity of large-scale power suppression is affected by the pre-inflationary physics.

27 pages, 11 figures; references and comments added, presentation improved, matches version published in Phys. Rev. D

References in corpus (30)

• A Critical Review of Classical Bouncing Cosmologies
• Galilean Genesis: an alternative to inflation
• Enhanced Non-Gaussianity from Excited Initial States
• Bouncing cosmology in modified Gauss-Bonnet gravity
• Matter Bounce Loop Quantum Cosmology from $F(R)$ Gravity
• Cosmological Perturbations Through a Non-Singular Ghost-Condensate/Galileon Bounce
• A Note on Calm Excited States of Inflation
• The pre-inflationary vacuum in the cosmic microwave background
• G-Bounce Inflation: Towards Nonsingular Inflation Cosmology with Galileon Field
• DBI Realizations of the Pseudo-Conformal Universe and Galilean Genesis Scenarios
• Wiggly Whipped Inflation
• Whipped inflation
• Just enough inflation: power spectrum modifications at large scales
• Bounce universe from string-inspired Gauss-Bonnet gravity
• A classical bounce: constraints and consequences
• Inflation from Minkowski Space
• The effect of varying sound velocity on primordial curvature perturbations
• CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity
• Pre - Inflationary Clues from String Theory ?
• Hemispherical Power Asymmetry from a Space-Dependent Component of the Adiabatic Power Spectrum
• Cosmological bounces in spatially flat FRW spacetimes in metric f(R) gravity
• Expected dipole asymmetry in CMB polarization
• Pre-inflationary genesis with CMB B-mode polarization
• String-Inspired Infinite-Derivative Theories of Gravity: A Brief Overview
• CMB hemispherical asymmetry from non-linear isocurvature perturbations
• Gravitational Wave Background from Phantom Superinflation
• Atick-Witten Hagedorn Conjecture, near scale-invariant matter and blue-tilted gravity power spectrum
• Scale-dependent hemispherical asymmetry from general initial state during inflation
• Jump in fluid properties of inflationary universe to reconcile scalar and tensor spectra
• CMB statistical anisotropies of classical and quantum origins

Cited by in corpus (4)

• $\Lambda$CDM Bounce Cosmology without $\Lambda$CDM: the case of modified gravity
• Pre-Inflationary Bounce Effects on Primordial Gravitational Waves of $f(R)$ Gravity
• Effects of a Pre-inflationary de Sitter Bounce on the Primordial Gravitational Waves in $f(R)$ Gravity Theories
• Lowering tensor-to-scalar ratio by pre-inflationary dynamics