Is the Spiral Galaxy a Cosmic Hurricane?
  It is discussed that the formation of the spiral galaxies is driven by the
cosmic background rotation, not a result of an isolated evolution proposed by
the density wave theory. To analyze the motions of the galaxies, a simple
double particle galaxy model is considered and the Coriolis force formed by the
rotational background is introduced. The numerical analysis shows that not only
the trajectory of the particle is the spiral shape, but also the relationship
between the velocity and the radius reveals both the existence of spiral arm
and the change of the arm number. In addition, the results of the
three-dimensional simulation also give the warped structure of the spiral
galaxies, and shows that the disc surface of the warped galaxy, like a spinning
coins on the table, exists a whole overturning movement. Through the analysis,
it can be concluded that the background environment of the spiral galaxies have
a large-scale rotation, and both the formation and evolution of hurricane-like
spiral galaxies are driven by this background rotation.
