We study DBI spinflation models with angular potentials that are derived in
string theory. We analyse the background dynamics with different parameter sets
and study the impact of changing each parameter on inflationary dynamics. It is
known that the conversion of the entropy perturbation into the curvature
perturbation gives multi-field DBI inflation models a possibility of satisfying
the observational constraints by relaxing the stringent microphysical
constraint that disfavours single field DBI inflation models. we show that our
model is excluded by the Planck satellite observations even with the conversion
mechanism regardless of the parameter set.Comment: 23 pages, 11 figures, matches published versio
