Gluon Scattering on Self-Dual Radiative Gauge Fields

Gluon Scattering on Self-Dual Radiative Gauge Fields
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自对偶辐射规范场上的胶子散射

DOI:
10.1007/s00220-022-04582-9
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发表时间:
2022
影响因子:
2.4
通讯作者:
Adamo T
Adamo T
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Adamo T

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我们提出了自对偶辐射背景上胶子散射的树级 S 矩阵的全多重性公式,该公式源自 MHV 部门的第一原理,并受到一般螺旋性扭量弦理论的启发。这些背景是手性的、渐进平坦的规范场,其特征在于其自由辐射数据,并且它们的潜在可积性由扭量理论捕获。树级胶子散射的散射幅度表示为从黎曼球到扭量空间的全纯映射模空间上的积分,映射的度数与外部胶子的螺旋度配置相关。在 MHV 领域,我们的公式源自 Yang-Mills 作用;对于一般螺旋性,公式是使用背景耦合扭量弦理论获得的,并通过了多项一致性测试。与平凡真空上的振幅不同,由于自对偶背景中的函数自由度,存在剩余积分,但是对于动量本征态的散射,我们能够明确地完成其中的许多工作,并且在平面波背景的特殊情况下甚至更多是可能的。一般来说,这些积分的数量总是小于标准微扰理论的预期,但与我们为自对偶平面波开发的自对偶背景场中时空 MHV 规则相关的数量相匹配。
We present all-multiplicity formulae, derived from first principles in the MHV sector and motivated by twistor string theory for general helicities, for the tree-level S-matrix of gluon scattering on self-dual radiative backgrounds. These backgrounds are chiral, asymptotically flat gauge fields characterised by their free radiative data, and their underlying integrability is captured by twistor theory. Tree-level gluon scattering scattering amplitudes are expressed as integrals over the moduli space of holomorphic maps from the Riemann sphere to twistor space, with the degree of the map related to the helicity configuration of the external gluons. In the MHV sector, our formula is derived from the Yang–Mills action; for general helicities the formulae are obtained using a background-coupled twistor string theory and pass several consistency tests. Unlike amplitudes on a trivial vacuum, there are residual integrals due to the functional freedom in the self-dual background, but for scattering of momentum eigenstates we are able to do many of these explicitly and even more is possible in the special case of plane wave backgrounds. In general, the number of these integrals is always less than expected from standard perturbation theory, but matches the number associated with space-time MHV rules in a self-dual background field, which we develop for self-dual plane waves.
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