Inflationary RSII Model with a Matter in the Bulk and Exponential
  Potential of Tachyon Field
  In this paper we study a tachyon cosmological model based on dynamics of a
3-brane in the second Randall-Sundrum (RSII) model extended to include matter
in the bulk. The presence of matter in the bulk changes warp factor which leads
to modification of inflationary dynamics. The additional brane behaves
effectively as a tachyon. We calculate numerically observation parameters of
inflation: the scalar spectral index ($n_s$) and the tensor-to-scalar ratio
($r$) for the exponential potential of tachyon field.
