Geometrical Tachyon Inflation in the Presence of a Bulk Tachyon Field
Abstract
Description
We present the study of the dynamics of the geometrical tachyon field on an unstable D3-brane in the background of a bulk tachyon field of a D3-brane solution of Type-0 string theory. We find that the geometrical tachyon potential is modified by a function of the bulk tachyon and inflation occurs at weak string coupling, where the bulk tachyon condenses, near the top of the geometrical tachyon potential. We also find a late accelerating phase when the bulk tachyon asymptotes to zero and the geometrical tachyon field reaches the minimum of the potential.
9 pages, 2 figures, talk presented at the "Brane-world Gravity: Progress and Problems" meeting and workshop, 18th - 29th September 2006, ICG, University of Portsmouth, UK and at the 12th Conference in the series "Recent Developments in Gravity" (NEB XII), 29th June - 2nd July 2006, Nafplio, Greece
9 pages, 2 figures, talk presented at the "Brane-world Gravity: Progress and Problems" meeting and workshop, 18th - 29th September 2006, ICG, University of Portsmouth, UK and at the 12th Conference in the series "Recent Developments in Gravity" (NEB XII), 29th June - 2nd July 2006, Nafplio, Greece