D-branes and BCFT in Hpp-wave backgrounds Original Research Article

In this paper we study two classes of symmetric D-branes in the Nappi–Witten gravitational wave, namely D2- and S1-branes. We solve the sewing constraints and determine the bulk-boundary couplings and the boundary three-point couplings. For the D2-brane our solution gives the first explicit results for the structure constants of the twisted symmetric branes