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arXiv 1709.03351hep-thmath-phmath.MP
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从动量空间到扭量空间的傅里叶变换

Fourier transform from momentum space to twistor space

Jun-ichi Note

摘要:

在扭量弦论中首次引入了从动量空间到扭量空间的傅立叶变换,并将其应用于三维实射影空间(对应于超双曲时空)的情形.在这种情况下,傅立叶变换与标准分析中的相同。然而,当扭量空间是一个三维复射影空间时,对应于复化的闵可夫斯基空间,傅里叶变换的某些方面还有待澄清。例如,没有计算复积分的具体方法,也不知道它应该应用于哪些函数或得到什么结果。本文利用复积分定义了动量空间函数的傅里叶变换,并假定动量空间函数可以展开为幂级数。我们还定义了扭转空间函数的逆傅里叶变换的一个特定的复积分。然后,我们表明,可以应用傅立叶变换的动量空间函数和所得到的扭曲空间函数可以表示在上同调群。此外,我们证明了扭量理论文献中流行的扭量算子表示对于傅里叶变换及其逆变换是有效的。我们还表明,该应用程序的运营商是封闭的功能,可以表示在上同调群。

英文摘要:

A Fourier transform from momentum space to twistor space is introduced in twistor string theory, for the first time, for the case where the twistor space is a three-dimensional real projective space, corresponding to ultra-hyperbolic spacetime. In this case, the Fourier transform is the same as in the standard analysis. However, when the twistor space is a three-dimensional complex projective space, corresponding to the complexified Minkowski space, some aspects of the Fourier transform have yet to be clarified. For example, no concrete method is known for calculating the complex integral, and nor is it known which functions it should be applied to or what results are obtained. In this paper, we define a Fourier transform for momentum-space functions in terms of a certain complex integral, assuming that the functions can be expanded as power series. We also define the inverse Fourier transform for twistor-space functions in terms of a certain complex integral. Then, we show that the momentum-space functions to which the Fourier transform can be applied and the twistor-space functions that are obtained can be represented in terms of cohomology groups. Furthermore, we show that the twistor operator representations popular in the twistor theory literature are valid for the Fourier transform and its inverse transform. We also show that the functions over which the application of the operators is closed can be represented in terms of cohomology groups.

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