Running of Running of the Spectral Index and WMAP Three-year data
نویسنده
چکیده
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. We calculate the running of running in usual inflation model and noncommutative inflation model. A large tensor-scalar ratio r ≥ 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.
منابع مشابه
Running Spectral Index in Noncommutative Inflation and WMAP Three Year Results
A model independent analysis shows that the running of the spectral index of the three year WMAP results can be nicely realized in noncommutative inflation. We also reexamine some concrete noncommutative inflation models. We find that a large tensor-scalar ratio is required, corresponding to a low number of e-folds before the end of inflation in some simple models. An epoch of accelerated expan...
متن کاملScale dependence of the primordial spectrum from combining the three-year WMAP, Galaxy Clustering, Supernovae, and Lyman-alpha forests
We probe the scale dependence of the primordial spectrum in the light of the three-year WMAP (WMAP3) alone and WMAP3 in combination with the other cosmological observations such as galaxy clustering and Type Ia Supernova (SNIa). We pay particular attention to the combination with the Lyman α (Lyα) forest. Different from the first-year WMAP (WMAP1), WMAP3’s preference on the running of the scala...
متن کاملA combined analysis of 3D weak lensing, Lyman-alpha forest and WMAP year three data
We present constraints on the amplitude and shape of the matter power spectrum and the density of dark matter within the framework of a standard ΛCDM model. We use a Markov chain Monte Carlo approach to combine independent measurements of the three-dimensional weak gravitational lensing shear field by the COSMOS survey, of lowand high-resolution Lyman-α (Lyα) forest flux power spectrum by SDSS ...
متن کاملNoncommutative KKLMMT Model
In the noncommutative space-time the fine tuning in KKLMMT model can be significantly released and a nice running of spectral index fitting the WMAP three year data can be achieved. The fitting results show that the noncommutative mass scale is roughly
متن کاملA Note on Noncommutative Brane Inflation
In this paper, we investigate the noncommutative KKLMMT D3/D3 brane inflation scenario in detail. Incorporation of the brane inflation scenario and the noncommutative inflation scenario can nicely explain the large negative running of the spectral index as indicated by WMAP three-year data and can significantly release the fine-tuning for the parameter β. Using the WMAP three year results (blue...
متن کامل