Spiral Structure Dynamics in Pure Stellar Disk Models
  In order to understand the physical mechanism underlying non-steady stellar
spiral arms in disk galaxies we performed a series of N-body simulations with
1.2 and 8 million particles. The initial conditions were chosen to follow
Kuijken-Dubinski models. In this work we present the results of a sub-sample of
our simulations in which we experiment with different disk central radial
velocity dispersion and the disk scale height.
