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arXiv 2304.04571hep-th
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无色S矩阵的正几何

Positive Geometries of S-matrix without Color

Mrunmay Jagadale, Alok Laddha

AI总结:

本文证明了ABHY结合多面体是无色标量树图级S矩阵的正几何,并指出一大类与ABHY结合多面体微分同胚的正几何为局域和幺正标量理论定义了振幅多面体。

摘要:

在本文中,我们证明了由Arkani-Hamed、Bai、He和Yun(ABHY)发现的结合多面体的实现是无色且通过三次耦合相互作用的标量树图级S矩阵的正几何。更详细地说,我们考虑了ABHY结合多面体的微分同胚像。这些微分同胚是由n个元素上的二面体群的右陪集参数化的线性映射。与这些ABHY结合多面体副本相关的所有边界的集合穷尽了所有的单极点。我们证明了ABHY结合多面体的微分同胚副本之和是一个正几何,并且通过对所有对偶结合多面体求和得到的总体积与具有三次耦合的(有质量或无质量)标量粒子的树图级S矩阵成正比。然后,我们提供了非平凡的证据,表明由Stokes多面体参数化的平面散射形式在这些结合多面体实现上的投影,会导致通过四次耦合相互作用的标量粒子的树图级振幅。我们的结果建立在我们之前工作中提出的想法之上,进一步证明了与ABHY结合多面体微分同胚的一大类正几何定义了某些局域和幺正标量理论树图级S矩阵的“振幅多面体”。我们还强调了在传播态无色时,将这些想法应用于发现单圈被积函数的正几何存在一个根本性障碍。

英文摘要:

In this note, we prove that the realization of associahedron discovered by Arkani-Hamed, Bai, He, and Yun (ABHY) is a positive geometry for tree-level S-matrix of scalars which have no color and which interact via cubic coupling. More in detail, we consider diffeomorphic images of the ABHY associahedron. The diffeomorphisms are linear maps parametrized by the right cosets of the Dihedral group on n elements. The set of all the boundaries associated with these copies of ABHY associahedron exhaust all the simple poles. We prove that the sum over the diffeomorphic copies of ABHY associahedron is a positive geometry and the total volume obtained by summing over all the dual associahedra is proportional to the tree-level S matrix of (massive or massless) scalar particles with cubic coupling. We then provide non-trivial evidence that the projection of the planar scattering forms parametrized by the Stokes polytope on these realizations of the associahedron leads to the tree-level amplitudes of scalar particles, which interact via quartic coupling. Our results build on ideas laid out in our previous works, leading to further evidence that a large class of positive geometries which are diffeomorphic to the ABHY associahedron defines an ``amplituhedron" for a tree-level S matrix of some local and unitary scalar theory. We also highlight a fundamental obstruction in applying these ideas to discover positive geometry for the one loop integrand when propagating states have no color.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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