A note on non-commutative brane inflation
- 1 December 2006
- journal article
- Published by IOP Publishing in Journal of Cosmology and Astroparticle Physics
- Vol. 2006 (12), 002
- https://doi.org/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 $eta$. 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 $g_s$ 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.
Keywords
Other Versions
This publication has 83 references indexed in Scilit:
- First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Preliminary Maps and Basic ResultsThe Astrophysical Journal Supplement Series, 2003
- First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Implications For InflationThe Astrophysical Journal Supplement Series, 2003
- First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Determination of Cosmological ParametersThe Astrophysical Journal Supplement Series, 2003
- Brane inflationPhysics Letters B, 1999
- Four-Year [ITAL]COBE[/ITAL] DMR Cosmic Microwave Background Observations: Maps and Basic ResultsThe Astrophysical Journal, 1996
- Structure in the COBE differential microwave radiometer first-year mapsThe Astrophysical Journal, 1992
- Cosmology for Grand Unified Theories with Radiatively Induced Symmetry BreakingPhysical Review Letters, 1982
- A new inflationary universe scenario: A possible solution of the horizon, flatness, homogeneity, isotropy and primordial monopole problemsPhysics Letters B, 1982
- First-order phase transition of a vacuum and the expansion of the UniverseMonthly Notices of the Royal Astronomical Society, 1981
- Inflationary universe: A possible solution to the horizon and flatness problemsPhysical Review D, 1981