\(H\)-branes and chiral strings (Q2772962)

In this paper a new type of branes is suggested: H-branes, which have only one single null direction in a space with a Lorentzian signature and which naturally support chiral closed string after analytical continuation. The attention is focused on the properties of these branes in flat space. An extra boundary term is added to the Polyakov action which leads to lightlike world sheet boundaries. The authors obtain the equations of motion that open strings must obey in Minkowski spacetime in a presence of H-branes. A Wick rotation is performed in both spacetime and world sheet to obtain chiral closed strings from open strings ending on an H-brane. An analogy between the model presented in this paper and dissipative quantum mechanics is discussed as well as Ishibashi states associated with prescribed boundary conditions.