Quantum slow-roll and quantum fast-roll inflationary initial conditions: CMB quadrupole suppression and further effects on the low CMB multipoles

Abstract

Quantum fast-roll initial conditions for the inflaton which are different from the classical fast-roll conditions and from the quantum slow-roll conditions can lead to inflation that last long enough. These quantum fast-roll initial conditions for the inflaton allow for kinetic energies of the same order of the potential energies and nonperturbative inflaton modes with nonzero wavenumbers. Their evolution starts with a transitory epoch where the redshift due to the expansion succeeds to assemble the quantum excited modes of the inflaton in a homogeneous (zero mode) condensate, and the large value of the Hubble parameter succeeds to overdamp the fast-roll of the redshifted inflaton modes. After this transitory stage the effective classical slow-roll epoch is reached. Most of the efolds are produced during the slow-roll epoch and we recover the classical slow-roll results for the scalar and tensor metric perturbations plus corrections. These corrections are important, both for scalar and for tensor perturbations, if scales which are horizon-size today exited the horizon by the end of the transitory stage and as a consequence the lower CMB multipoles get suppressed (fast-roll) or enhanced (precondensate). These two types of corrections can compete and combine in a scale dependent manner. They arise as natural consequences of the quantum nonperturbative inflaton dynamics, and provide a consistent and contrastable model for the origin of the suppression of the quadrupole and for other departures of the low CMB multipoles from the slow-roll inflation-LambdaCMB model which are to be contrasted to the TE and EE multipoles and to the forthcoming and future CMB data.

LaTeX, 14 pages, 3 figures

References in corpus (18)

• Reconstructing the Inflaton Potential --- an Overview
• Quantum corrections to slow roll inflation and new scaling of superhorizon fluctuations
• Quantum corrections to the inflaton potential and the power spectra from superhorizon modes and trace anomalies
• Non-Perturbative Quantum Dynamics of a New Inflation Model
• Closed Universes, de Sitter Space and Inflation
• MCMC analysis of WMAP3 and SDSS data points to broken symmetry inflaton potentials and provides a lower bound on the tensor to scalar ratio
• CMB quadrupole suppression: I. Initial conditions of inflationary perturbations
• The CMB Quadrupole depression produced by early fast-roll inflation: MCMC analysis of WMAP and SDSS data
• CMB quadrupole suppression: II. The early fast roll stage
• Clarifying Inflation Models: Slow-roll as an expansion in 1/N_{efolds}
• Non-equilibrium evolution of a `Tsunami': Dynamical Symmetry Breaking
• Inflation from Tsunami-waves
• The quantum inflaton, primordial perturbations and CMB fluctuations
• Out of Equilibrium Non-perturbative Quantum Field Dynamics in Homogeneous External Fields
• Conformal models of de Sitter space, initial conditions for inflation and the CMB
• Non-equilibrium dynamics in quantum field theory at high density: the tsunami
• Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field
• Out of equilibrium quantum field dynamics in external fields

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