A Note on Noncommutative Brane Inflation
arXiv:hep-th/0608207 · doi:10.1088/1475-7516/2006/12/002
Abstract
In this paper, we investigate the noncommutative KKLMMT D3/anti-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 . Using the WMAP three year results (blue-tilted spectral index with large negative running), we explore the parameter space and give the constraints and predictions for the inflationary parameters and cosmological observables in this scenario. We show that this scenario predicts a quite large tensor/scalar ratio and what is more, a too large cosmic string tension (assuming that the string coupling is in its likely range from 0.1 to 1) to be compatible with the present observational bound. A more detailed analysis reveals that this model has some inconsistencies according to the fit to WMAP three year results.
20 pages, 5 figures; accepted for publication in JCAP
References in corpus (12)
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- Observational constraints on patch inflation in noncommutative spacetime
- B polarization of cosmic microwave background as a tracer of strings
- Introduction to Cosmic F- and D-Strings
- Inflationary Potential Reconstruction for a WMAP Running Power Spectrum
- On vector mode contribution to CMB temperature and polarization from local strings
- Brane Inflation After WMAP Three Year Results
- Noncommutative chaotic inflation and WMAP three year results
- Running Spectral Index in Noncommutative Inflation and WMAP Three Year Results
- Noncommutative KKLMMT Model
- Nonminimal Inflation and the Running Spectral Index
- Braneworld cosmology and noncommutative inflation