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.

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

References in corpus (1)

• Inflation model constraints from the Wilkinson Microwave Anisotropy Probe three-year data

Cited by in corpus (2)

• Inflection-point Inflation and Dark Matter Redux
• Slow-roll reconstruction for running spectral index