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arXiv 2007.12145hep-thmath-phmath.MP
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关于四次相互作用III的正几何:多胞形的单圈被积

On the Positive Geometry of Quartic Interactions III : One Loop Integrands from Polytopes

Mrunmay Jagadale, Alok Laddha

摘要:

在Arkani-Hamed,He,Salvatori和Thomas(AHST)的开创性工作的基础上,我们探索了四次标量相互作用的正几何编码单圈散射振幅。我们定义了一类新的组合多面体,我们称之为伪accordiohedra的偏序集结构相关联的一个循环的被积函数与标量四次相互作用的奇点。伪手风琴参数化的抽象运动空间上的AHST和限制这些形式的D型associahedra定义的投影形式的家庭可以关联到一个循环的四次相互作用的被积。(投影形式的)限制也可以被认为是伪手风琴的某些几何实现上的规范顶形式。我们的工作探讨了一个大类的几何实现的类型D associahedra,其中包括所有的AHST实现。这些实现是基于Ceballos和Pilaud发现的D型簇代数的伪三角模型。

英文摘要:

Building on the seminal work of Arkani-Hamed, He, Salvatori and Thomas (AHST), we explore the positive geometry encoding one loop scattering amplitude for quartic scalar interactions. We define a new class of combinatorial polytopes that we call pseudo-accordiohedra whose poset structures are associated to singularities of the one loop integrand associated to scalar quartic interactions. Pseudo-accordiohedra parametrize a family of projective forms on the abstract kinematic space defined by AHST and restriction of these forms to the type-D associahedra can be associated to one-loop integrands for quartic interactions. The restriction (of the projective form) can also be thought of as a canonical top form on certain geometric realisations of pseudo-accordiohedra. Our work explores a large class of geometric realisations of the type-D associahedra which include all the AHST realisations. These realisations are based on the pseudo-triangulation model for type-D cluster algebras discovered by Ceballos and Pilaud.

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