4 papers
On Positive Celestial Geometry: ABHY in the Sky
Jin Dong, Stephan Stieberger
Celestial amplitudes are multiple Mellin transforms w.r.t. conformal dimensions. For arbitrary multiplicity of massless states in sufficiently high space--time dimension we…
High Energy String Theory and the Celestial Sphere
Xavier Kervyn, Stephan Stieberger
We elaborate on a string world-sheet connection to flat space-time holography. More specifically, in the high energy (zero tension) limit of tree-level string scattering in flat ba…
Superstring scattering on the real projective plane
Andreas Bischof, Stephan Stieberger
Superstring scattering from orientifold planes requires considering string amplitudes on world-sheets with crosscaps with the lowest order case (in string coupling constant) having…
Differential Equations for Carrollian Amplitudes
Romain Ruzziconi, Stephan Stieberger, Tomasz R. Taylor +1
Differential equations are powerful tools in the study of correlation functions in conformal field theories (CFTs). Carrollian amplitudes behave as correlation functions of Carroll…