Papers › Boundaries of the Amplituhedron with amplituhedronBoundaries
Boundaries of the Amplituhedron with amplituhedronBoundaries
Tomasz Lukowski, Robert Moerman
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Positive geometries provide a modern approach for computing scattering amplitudes in a variety of physical models. In order to facilitate the exploration of these new geometric methods, we introduce a Mathematica package called ``amplituhedronBoundaries'' for calculating the boundary structures of three positive geometries: the amplituhedron 𝒜_(n,k)⁽ᵐ⁾, the momentum amplituhedron ℳ_(n,k)⁽ᵐ⁾ and the hypersimplex Δ_(k,n). The first two geometries are relevant for scattering amplitudes in planar 𝒩=4 SYM, while the last one is a well-studied polytope appearing in many contexts in mathematics, and is closely related to ℳ_(n,k)⁽²⁾. The package includes an array of useful tools for the study of these positive geometries, including their boundary stratifications, drawing their boundary posets, and additional tools for manipulating combinatorial structures useful for positive Grassmannians.
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