2006/01/31 by Sarah E. Shandera, Sarah E Shandera, S. -H. Henry Tye +1 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #astro-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2006/05/007
published as JCAP0605:007,2006 · 31 pages, 12 figures; typo corrected
openalex publication_date 2006/05/12 · arxiv created 2010/01/03 · arxiv updated 2010/01/07 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Linking the slow-roll scenario and the Dirac–Born–Infeld scenario of ultra-relativistic roll (where, thanks to the warp factor, the inflaton moves slowly even with an ultra-relativistic Lorentz factor), we find that the KKLMMT D 3– -brane inflation is robust; that is, enough e -folds of inflation is quite generic in the parameter space of the model. We show that the intermediate regime of relativistic roll can be quite interesting observationally. Introducing appropriate inflationary parameters, we explore the parameter space and give the constraints and predictions for the cosmological observables in this scenario. Among other properties, this scenario allows the saturation of the present observational bound of either the tensor/scalar ratio r (in the intermediate regime) or the non-Gaussianity f NL (in the ultra-relativistic regime), but not both.