Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-05-31
Nucl.Phys.B701:299-333,2004
Physics
High Energy Physics
High Energy Physics - Theory
37 pages, latex file, no figures, heavy changes in language all along the paper, references added; to appear in Nuclear Physic
Scientific paper
10.1016/j.nuclphysb.2004.08.051
We study a system of coincident $D4$ and $\bar D 4$ branes with non zero world-volume magnetic fields in the weak coupling limit. We show that the conditions for absence of tachyons in the spectrum coincide exactly with those found in hep-th/0206041, in the low energy effective theory approach, for the system to preserve a $\frac 14$ of the supersymmetries of the Type IIA string theory vacuum. We present further evidence about the stability of the system by computing the lowest order interaction amplitude from both open and closed channels, thus verifying the no force condition as well as the supersymmetric character of the spectrum. A brief discussion of the low energy effective five dimensional world-volume theory is given.
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