Radiative Corrections to the Inflaton Potential as an Explanation of Suppressed Large Scale Power in Density Perturbations and the Cosmic Microwave Background

Abstract

The Wilkinson Microwave Anisotropy Probe microwave background data suggest that the primordial spectrum of scalar curvature fluctuations is suppressed at small wavenumbers. We propose a UV/IR mixing effect in small-field inflationary models that can explain the observable deviation in WMAP data from the concordance model. Specifically, in inflationary models where the inflaton couples to an asymptotically free gauge theory, the radiative corrections to the effective inflaton potential can be anomalously large. This occurs for small values of the inflaton field which are of the order of the gauge theory strong coupling scale. Radiative corrections cause the inflaton potential to blow up at small values of the inflaton field. As a result, these corrections can violate the slow-roll condition at the initial stage of the inflation and suppress the production of scalar density perturbations.

arXiv comment20 pages, 2 figures, v2: refs added, v3: JCAP version

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• Power Suppression at Large Scales in String Inflation
• Is Cosmic Parity Violation Responsible for the Anomalies in the WMAP Data?
• Running Spectral Index as a Probe of Physics at High Scales
• Non-Minimal Two-Loop Inflation
• Inflationary Parameters in Renormalization Group Improved ${\varphi }^4$ Theory
• Stability of Subsequent-to-Leading-Logarithm Corrections to the Effective Potential for Radiative Electroweak Symmetry Breaking
• Negative running prevents eternal inflation
• Exact One Loop Running Couplings in the Standard Model