Predictions of just-enough inflation

Abstract

We find the best-fit cosmological parameters for a scenario of inflation with only the sufficient amount of accelerated expansion for the $\lambda {\varphi }^4$ potential. While for the simplest scenario of chaotic inflation all observable primordial fluctuations cross the Hubble horizon during the slow-roll epoch, for the scenario of just-enough inflation the slow-roll conditions are violated at the largest length scales. Performing a numerical mode-by-mode integration for the perturbations on the largest scales and comparing the predicted anisotropies of the cosmic microwave background to results from the WMAP 7-yr data analysis, we find the initial conditions in agreement with current cosmological data. In contrast to the simplest chaotic model for the quartic potential, the just-enough inflation scenario is not ruled out. Although this scenario naturally gives rise to a modification of the first multipoles, for a quartic potential it cannot explain the lack of power at the largest angular scales.

12 pages, 8 figures, references added, presentation improved, matches published version

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Cited by in corpus (40)

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• Features and New Physical Scales in Primordial Observables: Theory and Observation
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• Kinetic Initial Conditions for Inflation
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• Bayesian inflationary reconstructions from Planck 2018 data
• Generating primordial features at large scales in two field models of inflation
• Low power on large scales in just enough inflation models
• Pre-inflationary primordial perturbations
• Constraining the kinetically dominated Universe
• Pre-slow roll initial conditions: large scale power suppression and infrared aspects during inflation
• A case for kinetically dominated initial conditions for inflation
• Generating enhanced parity-violating gravitational waves during inflation with violation of the null energy condition
• Emergent universe scenario and the low CMB multipoles
• Tensor to scalar ratio and large scale power suppression from pre-slow roll initial conditions
• Brane SUSY Breaking and the Gravitino Mass
• Pre-inflationary genesis with CMB B-mode polarization
• Analytical investigation of pre-inflationary effects in the primordial power spectrum: From General Relativity to hybrid Loop Quantum Cosmology
• Transients in finite inflation
• Parity violation in pre-inflationary bounce
• Negative running prevents eternal inflation
• Constraining Quantum Initial Conditions before Inflation
• Testing CMB Anomalies in E-mode Polarization with Current and Future Data
• Signatures of the Very Early Universe: Inflation, Spatial Curvature and Large Scale Anomalies
• Viability of slow-roll inflation in light of the non-zero k_min measured in the CMB power spectrum
• Quantum initial conditions for inflation and canonical invariance
• Pre-Inflationary Relics in the CMB?
• Towards the physical vacuum of cosmic inflation
• Choice of vacuum state and the relation between inflationary and Planck scales
• Reassessing Dust's Role in Forming the CMB
• Quantum initial conditions for curved inflating universes
• Emergent universe revisited through the CSL theory
• A Pop III generated dust screen at z~16
• Suppression of scalar power on large scales and associated bispectra
• Low-$\ell$ CMB from String-Scale SUSY Breaking?
• Unique contributions to the scalar bispectrum in `just enough inflation'
• Enlarging the Space of Viable Inflation Models: A Slingshot Mechanism
• Primordial perturbations in kinetically dominated regimes of general relativity and hybrid quantum cosmology
• Hidden in the background: a local approach to CMB anomalies
• Finite inflation in curved space