Minimal surfaces with mixed three-form flux

Abstract

We study minimal area world sheets ending on two concentric circumferences on the boundary of Euclidean $Ad{S}_3$ with mixed R-R and NS-NS three-form fluxes. We solve the problem by reducing the system to a one-dimensional integrable model. We find that the NS-NS flux term either brings the surface near to the boundary or separates the circumferences. In the limit of pure NS-NS flux the solution adheres to the boundary in the former case and the outer radius diverges in the latter. We further construct the underlying elliptic spectral curve, which allows us to analyze the deformation of other related minimal surfaces. We show that in the regime of pure NS-NS flux the elliptic curve degenerates.

15 pages. Latex. v2: Title changed together with minor updates to emphasize that minimal area surfaces in the presence of mixed fluxes are found. v3: Published version