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

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

2006-10-13

arxiv.org/abs/astro-ph/0610389v2

JCAP0611:004,2006

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1088/1475-7516/2006/11/004

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 $r\geq 1.23$ is needed in order to fit the WMAP data in the noncommutative inflation model, which roughly saturates the observational upper bound on it.

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