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hep-th2026
A Surface Integrand for the Inverse KLT Kernel
Christoph Bartsch, Karol Kampf, JiÅà Novotný +1
We propose a loop-level generalization of the inverse string theory Kawai-Lewellen-Tye (KLT) kernel: the planar inverse KLT integrand. The integrand is defined constructively via a…
hep-th2026★ 1 cited
Positive Geometry for Stringy Scalar Amplitudes
Christoph Bartsch, Karol Kampf, David Podivin +1
We introduce a new positive geometry, the associahedral grid, which provides a geometric realization of the inverse string theory KLT kernel. It captures the full -dependence…
hep-th2025
Soft Factor Structure of MHV Amplitudes for Massless Charged Particles
Christoph Bartsch, Karol Kampf, David PodivÃn
We present a simple derivation of MHV amplitudes in massless spinor and scalar electrodynamics. Working with permutationally invariant amplitudes, we show that they are fully deter…