Large tensor-to-scalar ratio and running of the scalar spectral index with Instep Inflation

Abstract

If a sizeable tensor-to-scalar ratio ~0.1 turns out to be detected and a negative running of the scalar spectral index ~0.01 is significantly required by the data, the vast majority of single field models of inflation will be ruled out. We show that a flat tree-level effective potential, lifted by radiative corrections and by the imprints of a high energy scale (in the form of non-renormalizable operators) can explain those features and produce enough inflation in the slow-roll regime.

16 pages, 2 figures, to appear in Physical Review D

References in corpus (11)

• The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview
• Toward an Understanding of Foreground Emission in the BICEP2 Region
• A joint analysis of Planck and BICEP2 B modes including dust polarization uncertainty
• Bayesian Analysis of Inflation: Parameter Estimation for Single Field Models
• Fingerprints of Galactic Loop I on the Cosmic Microwave Background
• Chaotic Inflation in Supergravity after Planck and BICEP2
• On quantifying and resolving the BICEP2/Planck tension over gravitational waves
• Constraint on the primordial gravitational waves from the joint analysis of BICEP2 and Planck HFI 353 GHz dust polarization data
• Genus Topology and Cross-Correlation of BICEP2 and Planck 353 GHz B-Modes: Further Evidence Favoring Gravity Wave Detection
• Flat Tree-level Inflationary Potentials in Light of CMB and LSS Data
• A note of clarification: BICEP2 and Planck are not in tension

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• Inflation that runs naturally: Gravitational waves and suppression of power at large and small scales
• Radiative Corrections from Heavy Fast-Roll Fields during Inflation