The two-loop Amplituhedron

Gabriele Dian, Elia Mazzucchelli, Felix Tellander

The loop-Amplituhedron ${\mathcal{A}}_n^{(L)}$ is a semialgebraic set in the product of Grassmannians ${\mathrm{Gr}}_{\mathbb{R}}(2,4{)}^L$. Recently, many aspects of this geometry for…