  A quantum-mechanical technique is used within the framework of U(2)
super-Yang-Mills theory to investigate processes after recombination of two
D-p-branes at one angle. Two types of initial conditions are considered, one of
which with $p=4$ is a candidate of inflation mechanism. It is shown that the
branes' shapes come to have three extremes due to localization of tachyon
condensation. ``Pair-creations'' of open stings connecting the recombined
branes is also observed. The appearance of closed strings is also discussed;
the decaying branes are shown to radiate non-vanishing gravitational wave,
which may be interpreted as evidence of closed string appearance. A few
speculations are also given on implications of the above phenomena for an
inflation model.
