The loop momentum amplituhedron
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Publication:6105285
DOI10.1007/JHEP05(2023)183arXiv2210.01127MaRDI QIDQ6105285
Author name not available (Why is that?)
Publication date: 26 June 2023
Published in: (Search for Journal in Brave)
Abstract: In this paper we focus on scattering amplitudes in maximally supersymmetric Yang-Mills theory and define a long sought-after geometry, the loop momentum amplituhedron, which we conjecture to encode tree and (the integrands of) loop amplitudes in spinor helicity variables. Motivated by the structure of amplitude singularities, we define an extended positive space, which enhances the Grassmannian space featuring at tree level, and a map which associates to each of its points tree-level kinematic variables and loop momenta. The image of this map is the loop momentum amplituhedron. Importantly, our formulation provides a global definition of the loop momenta. We conjecture that for all multiplicities and helicity sectors, there exists a canonical logarithmic differential form defined on this space, and provide its explicit form in a few examples.
Full work available at URL: https://arxiv.org/abs/2210.01127
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