177 citations · 2.5k across the 51 of their papers we have counts for
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Natural Boundaries for Scattering Amplitudes
Sebastian Mizera
Singularities, such as poles and branch points, play a crucial role in investigating the analytic properties of scattering amplitudes that inform new computational techniques. In t…
Unitarity Cuts of the Worldsheet
Lorenz Eberhardt, Sebastian Mizera
We compute the imaginary parts of genus-one string scattering amplitudes. Following Witten's prescription for the integration contour on the moduli space of worldshe…
Celestial Geometry
Sebastian Mizera, Sabrina Pasterski
Celestial holography expresses -matrix elements as correlators in a CFT living on the night sky. Poincaré invariance imposes additional selection rules on the allowed…
What is the for the S-matrix?
Holmfridur S. Hannesdottir, Sebastian Mizera
Can the S-matrix be complexified in a way consistent with causality? Since the 1960's, the affirmative answer to this question has been well-understood for scattering of…
Feynman Polytopes and the Tropical Geometry of UV and IR Divergences
Nima Arkani-Hamed, Aaron Hillman, Sebastian Mizera
We introduce a class of polytopes that concisely capture the structure of UV and IR divergences of general Feynman integrals in Schwinger parameter space, treating them in a unifie…
On Unitarity of Tree-Level String Amplitudes
Nima Arkani-Hamed, Lorenz Eberhardt, Yu-tin Huang +1
Four-particle tree-level scattering amplitudes in string theory are magically consistent with unitarity, reflected in the non-trivial fact that beneath the critical dimension, the…