2007/11/26 by John Ward · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #hep-th
paper · pdf · doi:10.1088/1126-6708/2007/12/045
published as JHEP 0712:045,2007 · 33 pages, 8 figures. References added and typos corrected. Submitted to JHEP
arxiv created 2007/11/26 · openalex publication_date 2007/12/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
We investigate DBI inflation using N multiple branes and show how the configuration is equivalent to a single wrapped D5-brane with flux. We then show how 1/N corrections can be implemented, and we examine the sound speed and levels of non-Gaussianities in two distinct cases. For models with constant warping we find that the non-Gaussian amplitude is bounded from above (as a function of γ). For AdS backgrounds we find that the signature is generally large and positive, although is no longer globally defined over the full phase space. We then investigate an inflationary mechanism using a representation cascade, whereby the transition from a reducible representation to the irrep drives inflation.