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arXiv 0907.4107hep-th
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N=4 SYM理论中所有树幅值的扭量变换

Twistor transform of all tree amplitudes in N=4 SYM theory

G. P. Korchemsky, E. Sokatchev

摘要:

我们执行扭量(半傅立叶)变换的所有树n粒子的超级振幅在N=4 SYM,并表明它有一个透明的几何解释。我们发现N^kMHV振幅在扭量空间中由一组(2k+1)相交线支撑,并证明了相应的线模在模空间中形成一个类光(2k+1)边形.这个多边形被三角化为两种位于不同平面上的类光三角形。我们用简单的图形规则来构造三角形,从三角形中可以直接得到扭量空间和动量空间中N^kMHV振幅的解析表达式。我们还讨论了扭量空间中的普通共形性和对偶共形性以及伪奇点的消除。

英文摘要:

We perform the twistor (half-Fourier) transform of all tree n-particle superamplitudes in N=4 SYM and show that it has a transparent geometric interpretation. We find that the N^kMHV amplitude is supported on a set of (2k+1) intersecting lines in twistor space and demonstrate that the corresponding line moduli form a lightlike (2k+1)-gon in moduli space. This polygon is triangulated into two kinds of lightlike triangles lying in different planes. We formulate simple graphical rules for constructing the triangulated polygons, from which the analytic expressions of the N^kMHV amplitudes follow directly, both in twistor and in momentum space. We also discuss the ordinary and dual conformal properties and the cancellation of spurious singularities in twistor space.

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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