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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…
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…
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…