Nonsupersymmetric brane/antibrane configurations in type IIA and M theory Original Research Article

We study metastable nonsupersymmetric configurations in type IIA string theory, obtained by suspending D4-branes and image-branes between holomorphically curved NS5ʹs, which are related to those of by T-duality. When the numbers of branes and antibranes are the same, we are able to obtain an exact M theory lift which can be used to reliably describe the vacuum configuration as a curved NS5 with dissolved RR flux for image and as a curved M5 for image. When our weakly coupled description is reliable, it is related by T-duality to the deformed IIB geometry with flux of with moduli exactly minimizing the potential derived therein using special geometry. Moreover, we can use a direct analysis of the action to argue that this agreement must also hold for the more general brane/antibrane configurations of . On the other hand, when our strongly coupled description is reliable, the M5 wraps a nonholomorphic minimal area curve that can exhibit quite different properties, suggesting that the residual structure remaining after spontaneous breaking of supersymmetry at tree level can be further broken by the effects of string interactions. Finally, we discuss the boundary condition issues raised in for nonsupersymmetric IIA configurations, their implications for our setup, and their realization on the type IIB side.