Running of Running of the Spectral Index and WMAP Three-year data

Abstract

Three-year data of WMAP implies not only a negative running of the spectral index with large absolute value, but also a large positive running of running of the spectral index with order of the magnitude $10^{-2}$. We calculate the running of running in usual inflation model and noncommutative inflation model. A large tensor-scalar ratio $r\ge 1.23$ is needed in order to fit the WMAP data in the noncommutative inflation model, which roughly saturates the observational upper bound on it.

arXiv comment15 pages, 4 figures; references and one figure are added, version for publication in JCAP

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Cited by in corpus (8)

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• Precise Measurements of Primordial Power Spectrum with 21 cm Fluctuations
• Is Noncommutative Eternal Inflation Possible?
• Inflection-point Inflation and Dark Matter Redux
• Modulated Inflation Models and Primordial Black Holes
• Slow-roll reconstruction for running spectral index
• Discrepancies between observational data and theoretical forecast in single field slow roll inflation