D-brane dynamics and creations of open and closed strings after recombination Original Research Article

A quantum-mechanical technique is used within the framework of U(2) super-Yang–Mills theory to investigate what happens in the process after recombination of two Dp-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 observed that the branesʹ shapes come to have three extremes due to localization of tachyon condensation. Furthermore, open string pairs connecting the decaying D-branes are shown to be created; most part of the released energy is used to create them. It also strongly suggests that creation of closed strings happens afterward. Closed strings as gravitational radiation from the D-branes are also shown to be created. A few speculations are also given on implications of the above phenomena for an inflation model.