Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-01-22
Phys.Rev.D77:126017,2008
Physics
High Energy Physics
High Energy Physics - Theory
36 pages, 4 figures
Scientific paper
10.1103/PhysRevD.77.126017
In the framework of boundary conformal field theory we consider a flat unstable D$p$-brane in the presence of a large constant electromagnetic field. Specifically, we study the case that the electromagnetic field satisfy the following three conditions: (i) a constant electric field is turned on along the $x^1$ direction ($E_{1}\ne 0$); (ii) the determinant of the matrix $(\eta + F)$ is negative so that it lies in the physical region ($-\det (\eta + F)>0$); (iii) the 11-component of its cofactor is positive to the large electromagnetic field. In this case, we identify exactly marginal deformations depending on the spatial coordinate $x^1$. They correspond to tachyon profiles of hyperbolic sine, exponential, and hyperbolic cosine types. Boundary states are constructed for these deformations by utilizing T-duality approach and also by directly solving the overlap conditions in BCFT. The exponential type deformation gives a tensionless half brane connecting the perturbative string vacuum and one of the true tachyon vacua, while the others have negative tensions. This is in agreement with the results obtained in other approaches.
Ishida Akira
Kim Chanju
Kim Yoonbai
Kwon O-Kab
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