Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-07-17
JHEP 0008 (2000) 036
Physics
High Energy Physics
High Energy Physics - Theory
19 pages, harvmac (b), no figures, v2: reference added, v3: reference added, version to appear in JHEP
Scientific paper
10.1088/1126-6708/2000/08/036
In this paper properties of D branes in a nine dimensional asymmetric orbifold are discussed, using a $(-1)^{F_L}\sigma_{1/2}$ projection, where $F_L$ is the leftmoving space-time fermion number and $\sigma_{1/2}$ is a freely acting shift of order two. There are two types of non BPS D branes, which are stable at $R>2$ and $R<2$ respectively. At R=2 there is a perturbative enhancement of gauge symmetry and the two types of branes are related by a global bulk symmetry transformation. At this point in the moduli space the associated boundary states are constructed using a free fermion representation of the theory. Some aspects of the enhancement of gauge symmetry in the S-dual type $\tilde I$ theory are discussed.
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