Giuseppe D'Appollonio, Elias Kiritsis
D--Branes and BCFT in Hpp--Wave Backgrounds
Preprint series: ESI preprints

MSC:

81T30 String and superstring theories; other extended objects , See also {83E30}

81T40 Two-dimensional field theories, conformal field theories, etc.

PACS: 11.25.-w,11.25.Hf
Abstract: In this paper we study two classes of symmetric
D-branes in the Nappi-Witten gravitational wave, namely D2 and $S
1$ 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 in a WZW
model. We also compute the boundary four-point functions,
providing examples of open string four-point amplitudes in a
curved background. We finally discuss the annulus amplitudes, the
relation with branes in $AdS_3$ and in $S^3$ and the analogy
between the open string couplings in the $H_4$ model and the
couplings for magnetized and intersecting branes.