3 papers
hep-th2025
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 o…
hep-th2025
Soft Factor Structure of MHV Amplitudes for Massless Charged Particles
Christoph Bartsch, Karol Kampf, David Podivín
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…
hep-th2025
Universality of Colored Scalars from the Stringy KLT Kernel
Christoph Bartsch, Karol Kampf, Jiří Novotný +1
A new perspective on the inverse string theory Kawai-Lewellen-Tye (KLT) kernel is provided which establishes the universality of scattering amplitudes in the bi-adjoint scalar (BAS…