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arXiv 1605.08758hep-th
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树级和环路级CHY振幅的多项式简化和评估

Polynomial reduction and evaluation of tree- and loop-level CHY amplitudes

Michael Zlotnikov

摘要:

我们开发了一个多项式约简程序,将任何规范固定的CHY振幅被积$n$散射粒子到一个$σ$模多元多项式,我们称之为$\textit{standard form}$。我们证明了一个标准型多项式必须有一个特定的$\textit{ladder type}$单项结构,它在任何$n$上都有有限的大小,最高多元度由$(n-3)(n-4)/2$给出。这组单项式跨越了一个完整的基础上的散射方程的支持下,在运动学数据的有理系数多项式。随后,在树和一个循环的水平上,我们采用了全球残留定理,以获得一个处方,通过收集简单的残留物在无穷大的方式来评估任何CHY振幅。处方,然后明确地应用到一些树和单回路振幅的例子。

英文摘要:

We develop a polynomial reduction procedure that transforms any gauge fixed CHY amplitude integrand for $n$ scattering particles into a $σ$-moduli multivariate polynomial of what we call the $\textit{standard form}$. We show that a standard form polynomial must have a specific $\textit{ladder type}$ monomial structure, which has finite size at any $n$, with highest multivariate degree given by $(n-3)(n-4)/2$. This set of monomials spans a complete basis for polynomials with rational coefficients in kinematic data on the support of scattering equations. Subsequently, at tree and one-loop level, we employ the global residue theorem to derive a prescription that evaluates any CHY amplitude by means of collecting simple residues at infinity only. The prescription is then applied explicitly to some tree and one-loop amplitude examples.

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