2006/08/31 by Xin Zhang · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Noncommutative and Quantum Gravity Theories #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2006/12/002
published as JCAP0612:002,2006 · 20 pages, 5 figures; accepted for publication in JCAP
arxiv created 2006/11/07 · openalex publication_date 2006/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
In this paper, we investigate the non-commutative KKLMMT (Kachru–Kallosh–Linde–Maldacena–McAllister–Trivedi) -brane inflation scenario in detail. Incorporation of the brane inflation scenario and the non-commutative 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-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.