  A model of tachyon inflation is proposed in the framework of holographic
cosmology. The model is based on a holographic braneworld scenario with a
D3-brane located at the holographic boundary of an asymptotic ADS$_5$ bulk. The
tachyon field that drives inflation is represented by a DBI action on the
brane. We solve the evolution equations analytically in the slow-roll regime
and solve the exact equations numerically. We calculate the inflation
parameters and compare the results with Planck 2018 data.
