The dual Amplituhedron volume conjecture

Let A{\mathcal A} be an Amplituhedron embedded in an irreducible variety XX, and let YX\mathcal Y\in X lie away from the boundary of A{\mathcal A}. Dual Amplituhedron volume conjecture. There exists an irreducible dual variety XYX^*_{\mathcal Y} and a bijection between positive geometries in XX and positive geometries in XYX^*_{\mathcal Y}, sending A{\mathcal A} to a dual Amplituhedron AY{\mathcal A}^*_{\mathcal Y}, reversing inclusions and preserving triangulations. Moreover, there is a Y\mathcal Y-dependent measure dVold\operatorname{Vol} on XY(R)X^*_{\mathcal Y}(\mathbb R) such that

Ω(B)(Y)=Vol(BY):=BYdVol\underline{\Omega}(\mathcal B)(\mathcal Y)=\operatorname{Vol}(\mathcal B^*_{\mathcal Y}):=\int_{\mathcal B^*_{\mathcal Y}}d\operatorname{Vol}

for every positive geometry B\mathcal B in XX. The conjecture extends the dual-polytope volume formula to Amplituhedra; the source restricts the discussion to even mm because the volume formulation requires positive convexity, which generally fails for odd mm.

Sources & referencesView supporting material

Primary source

Nima Arkani-Hamed, Yuntao Bai and Thomas Lam, “Positive Geometries and Canonical Forms”, arXiv:1703.04541 (2017).

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