  In cores of supernovae and crusts of neutron stars, nuclei can adopt
interesting shapes, such as rods or slabs, etc., which are referred to as
nuclear "pasta." Recently, we have been studying the pasta phases focusing on
their dynamical aspects with quantum molecular dynamic (QMD) approach. We
review our findings on the following topics: dynamical formation of the pasta
phases by cooling down the hot uniform nuclear matter; a phase diagram on the
density versus temperature plane; structural transitions between the pasta
phases induced by compression and their mechanism. Properties of the nuclear
interaction used in our works are also discussed.
