Motivated by superstring theories on AdS3, we construct spacetime superconformal algebras (SCAs) living on the AdS3 boundary in terms of the transversal physical degrees of freedom. The SCAs constructed are N=4 large, middle algebras, and N = 3 algebra, corresponding to superstring theories on AdS3 × S × S × S, AdS3 × S × T 4 and AdS3 × (S × S × S)/Z2 backgrounds respectively. e-mail: jingj@itp...

We regulate Witten’s open superstring field theory by replacing the picturechanging insertion at the midpoint with a contour integral of picture changing insertions over the half-string overlaps of the cubic vertex. The resulting product between string fields is non-associative, but we provide a solution to the A∞ relations defining all higher vertices. The result is an explicit covariant super...

The free action for massless Ramond-Ramond fields is derived from closed superstring field theory using the techniques of Siegel and Zwiebach. For the uncompactified Type IIB superstring, this gives a manifestly Lorentz-covariant action for a self-dual five-form field strength. Upon compactification to four dimensions, the action depends on a U(1) field strength from 4D N=2 supergravity. Howeve...

Motivated by recent developments in superstring theory in the cosmological context, we examine a field theory which contains string networks with 3-way junctions. We perform numerical simulations of this model, identify the length scales of the network that forms, and provide evidence that the length scales tend towards a scaling regime, growing in proportion to time. We infer that the presence...