Geometrical Tachyon Dynamics in the Background of a Bulk Tachyon Field
arXiv:hep-th/0601152 · doi:10.1088/1126-6708/2006/05/038
Abstract
We study the dynamics of a D3-brane moving in the background of a bulk tachyon field of a D3-brane solution of Type-0 string theory. We show that the dynamics on the probe D3-brane can be described by a geometrical tachyon field rolling down its potential which 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 which in the geometrical tachyon picture corresponds to the minimum of the geometrical potential.
arXiv comment27 pages, 2 figures, accepted for publication in JHEP
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