Abstract
In this paper properties of D-branes in a nine dimensional asymmetric orbifold are discussed, using a (−1)FLσ1/2 projection, where FL is the leftmoving space-time fermion number and σ1/2 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-Ĩ theory are discussed.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
