Open strings in type IIB AdS${}_3$ flux vacua

The role of open strings is investigated in the context of AdS${}_3$ flux vacua arising from type IIB orientifold reductions. On the one hand, contrary to expectations, the perturbative stability of certain recently found non-supersymmetric AdS${}_3$ flux vacua is shown to be robust under fluctuations of the open-string moduli. On the other hand, a wealth of new perturbatively stable AdS${}_3$ flux vacua appears as a consequence of the non-trivial dynamics of open-string moduli. We also comment on the issue of scale separation in these AdS${}_3$ flux vacua.