| DATE: |
2005-01-18 11:00 - |
| PLACE: |
Kenkyu Honkan 2F RM220 |
| TITLE: |
Open String Tachyon in Supergravity Solution |
| CONTACT: |
tango |
| SPEAKER: |
Dr. Shinpei Kobayashi (RESCEU) |
| LANGUAGE: |
Japanese |
| ABSTRACT: |
We study the tachyon condensation of the D-\bar{D}-brane system with a
constant tachyon vev in the context of classical solutions of the Type II
supergravity.
We find that the general solution with the symmetry ISO(1,p)xSO(9-p) (the
three-parameter solution) includes the extremal black p-brane solution as an
appropriate limit of the solution with fixing one of the three parameters(c_1).
Furthermore, we compare the long distance behavior of the solution with the
massless modes of the closed strings from the boundary state of the
D-\bar{D}-brane system with a constant tachyon vev. We find that we must fix c_1
to zero and the only two parameters are needed to express the tachyon
condensation of the D\={D}-brane system. This means that the parameter $c_1$
does not correspond to the tachyon vev of the D\={D}-brane system. |
|
