4 papers
Excited D-branes and Supergravity Solutions
Tsuguhiko Asakawa, Shinpei Kobayashi, So Matsuura
We investigate the general solution with the symmetry ISO(1,p)xSO(9-p) of Type II supergravity (the three-parameter solution) from the viewpoint of the superstring theory. We find…
Open String Tachyon in Supergravity Solution
Shinpei Kobayashi, Tsuguhiko Asakawa, So Matsuura
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 gene…
Closed String Field Theory with Dynamical D-brane
Tsuguhiko Asakawa, Shinpei Kobayashi, So Matsuura
We consider a closed string field theory with an arbitrary matter current as a source of the closed string field. We find that the source must satisfy a constraint equation as a co…
Cosmology with Radion and Bulk Scalar Field in Two Branes Model
Shinpei Kobayashi, Kazuya Koyama
We investigate cosmological evolutions of the bulk scalar field and the radion in five-dimensional dilatonic two branes model. The bulk potential for the scalar field…