Penrose limits of non-standard brane intersections

Moduli and Brane Intersections

We discuss the worldvolume description of intersecting D-branes, including the metric on the moduli space of deformations. We impose a choice of static gauge that treats all the branes on an equal footing and describes the intersection of D-branes as an embedded special Lagrangian three-surface. Some explicit solutions to these equations are given and their interpretation in terms of a superpot...

Null Brane Intersections

We study pairs of D-branes intersecting on null hypersurfaces, and other related configurations. These are supersymmetric and have finite energy density. They are open-string analogues of the parabolic orbifold and null-fluxbrane backgrounds for closed superstrings. We derive the spectrum of open strings, showing in particular that if the Dbranes are shifted in a spectator dimension so that the...

Penrose Limits and Spacetime

We give a covariant characterisation of the Penrose plane wave limit: the plane wave profile matrix A(u) is the restriction of the null geodesic deviation matrix (curvature tensor) of the original spacetime metric to the null geodesic, evaluated in a comoving frame. We also consider the Penrose limits of spacetime singularities and show that for a large class of black hole, cosmological and nul...

Multi-angle Five-Brane Intersections

We find new solutions of IIA supergravity which have the interpretation of intersecting NS-5-branes at Sp(2)-angles on a string preserving at least 3/32 of supersymmetry. We show that the relative position of every pair of NS-5-branes involved in the superposition is determined by four angles. In addition we explore the related configurations in IIB strings and M-theory.

Plane Waves and Penrose Limits