138 citations · 509 across the 15 of their papers we have counts for
15 papers
Deformations of JT Gravity via Topological Gravity and Applications
Stefan Forste, Hans Jockers, Joshua Kames-King +1
We study the duality between JT gravity and the double-scaled matrix model including their respective deformations. For these deformed theories we relate the thermal partition func…
Nearly AdS2 Sugra and the Super-Schwarzian
Stefan Forste, Iris Golla
In nearly AdS2 gravity the Einstein-Hilbert term is supplemented by the Jackiw-Teitelboim action. Integrating out the bulk metric gives rise to the Schwarzian action for the bounda…
Proton Hexality in Local Grand Unification
Stefan Forste, Hans Peter Nilles, Saul Ramos-Sanchez +1
Proton hexality is a discrete symmetry that avoids the problem of too fast proton decay in the supersymmetric extension of the standard model. Unfortunately it is inconsistent with…
Orientifold's Landscape: Non-Factorisable Six-Tori
Stefan Forste, Cristina Timirgaziu, Ivonne Zavala
We construct type IIA orientifolds on T6/(Z2 x Z2) which admit non factorisable lattices. We describe a method to deal with this kind of configurations and discuss how the compacti…
Non-Factorisable Z2 times Z2 Heterotic Orbifold Models and Yukawa Couplings
Stefan Forste, Tatsuo Kobayashi, Hiroshi Ohki +1
We classify compactification lattices for supersymmetric Z2 times Z2 orbifolds. These lattices include factorisable as well as non-factorisable six-tori. Different models lead to d…
Deformations of WZW models
Stefan Forste
Current-current deformations for WZW models of semisimple compact groups are discussed in a sigma model approach. We start with the abelian rank one group U(1). Afterwards, we keep…
D-branes in a marginally deformed WZW model
Stefan Forste
In this talk we discuss symmetry preserving D-branes on a line of a marginally deformed SU(2) WZW model. A semiclassical and a quantum theoretical approach are presented.
D-branes on a Deformation of SU(2)
Stefan Forste
We discuss D-branes on a line of conformal field theories connected by an exact marginal deformation. The line contains an SU(2) WZW model and two mutually T-dual SU(2)/U(1) cosets…
Fine-Tuning of the Cosmological Constant in Brane Worlds
Stefan Forste
We discuss how the fine-tuning of the cosmological constant enters brane world setups. After presenting the Randall Sundrum model as a prototype case, we focus on single brane mode…
The Cosmological Constant Problem from a Brane-World Perspective
Stefan Forste, Zygmunt Lalak, Stéphane Lavignac +1
We point out several subtleties arising in brane-world scenarios of cosmological constant cancellation. We show that solutions with curvature singularities are inconsistent, unless…
Strings from Orientifolds
Stefan Forste, Debashis Ghoshal
We construct models in 1+1 dimensions with chiral (0,N) supersymmetry by taking orientifolds of type IIB on an eight-torus identified by different numbers of reflections. The resul…
An orientifold of the solitonic fivebrane
Stefan Forste, Debashis Ghoshal, Sudhakar Panda
We study an orientifold of the solitonic fivebrane of type II string theory. The consideration is restricted to a space-time domain which can be described by an exact conformal fie…
Duality in String Theory
Stefan Forste, Jan Louis
In this lecture we review some of the recent developments in string theory on an introductory and qualitative level. In particular we focus on S-T-U dualities of toroidally compact…
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…
String--Kaluza--Klein Cosmology
K. Behrndt, S. Foerste
We generalize a five dimensional black hole solution of low energy effective string theory to arbitrary constant spatial curvature. After interchanging the signature of time and ra…