54 citations · 85 across the 5 of their papers we have counts for
5 papers
Instanton effects in string cosmology
Klaus Behrndt, Stefan Forste, Stefan Schwager
We consider the gauge dyonic string solution of the K3 compactified heterotic string theory in a four dimensional cosmological context. Since for this solution Green-Schwarz as wel…
T-duality for open strings with respect to non-abelian isometries
Stefan Forste, Alexandros A. Kehagias, Stefan Schwager
We gauge the non-abelian isometries of a sigma model with boundaries. Forcing the field strength of the gauge fields to vanish renders the gauged model equivalent to the ungauged o…
String Kaluza-Klein cosmologies with RR-fields
R. Poppe, S. Schwager
We construct 4-dimensional cosmological FRW--models by compactifying a black 5-brane solution of type IIB supergravity, which carries both magnetic NS-NS-charge and RR-charge. The…
Non-Abelian T-duality for open strings
Stefan Forste, Alexandros A. Kehagias, Stefan Schwager
In the first part of the talk we discuss T-duality for a free boson on a world sheet with boundary in a setting suitable for the generalization to non-trivial backgrounds. The gaug…
Non-Abelian Duality for Open Strings
S. Forste, A. Kehagias, S. Schwager
We examine non-abelian duality transformations in the open string case. After gauging the isometries of the target space and developing the general formalism, we study in details t…