MHV gluon scattering amplitudes from celestial current algebras

MHV gluon scattering amplitudes from celestial current algebras
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天体电流代数的 MHV 胶子散射振幅

DOI:
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发表时间:
2020
影响因子:
5.4
通讯作者:
Sudip Ghosh
Sudip Ghosh
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shamik Banerjee;Sudip Ghosh

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我们证明了n点树能级MHV胶子散射振幅(在纯Yang-Mills理论中也称为天体振幅)的Mellin变换满足对应于n-2个正螺旋度胶子的n-2个线性一阶偏微分方程组.虽然这些方程非常类似于SU(N)流代数的Knizhnik-Zamoldochikov方程,但也有一个来自次领导软胶子流代数的额外“校正”项。这些方程可以用来计算天球上胶子-胶子OPE中的主导项。类似的方程也可以写下来的动量空间树水平MHV散射振幅。我们还提出了一种方法来处理子超前电流代数生成器在换流情况下的不封闭性。然后,这是用来计算混合螺旋胶子OPE中的一些子领先的条款。
We show that the Mellin transform of an n-point tree level MHV gluon scattering amplitude, also known as the celestial amplitude in pure Yang-Mills theory, satisfies a system of (n−2) linear first order partial differential equations corresponding to (n−2) positive helicity gluons. Although these equations closely resemble Knizhnik-Zamoldochikov equations for SU(N) current algebra there is also an additional “correction” term coming from the subleading soft gluon current algebra. These equations can be used to compute the leading term in the gluon-gluon OPE on the celestial sphere. Similar equations can also be written down for the momentum space tree level MHV scattering amplitudes. We also propose a way to deal with the non closure of subleading current algebra generators under commutation. This is then used to compute some subleading terms in the mixed helicity gluon OPE.
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