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arXiv 2209.02776hep-th
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二维理论的 celestial 振幅

Celestial amplitude for 2d theory

Sarthak Duary

AI总结:

本文研究二维理论的 celestial 振幅,证明其为 S-矩阵的傅里叶变换,并检验交叉性和幺正性,发现仅靠这些条件不足以 bootstrap,需额外项;同时探讨引力 dressing 对极点的影响。

摘要:

我们探索对应于二维体 $\backslash$mathcal{S}$-矩阵的 celestial 振幅。我们考虑具有相同质量的标量粒子,并证明 celestial 振幅成为用快度变量书写的二维 $\backslash$mathcal{S}$-矩阵的傅里叶变换。我们将交叉性和幺正性条件转化为对 celestial 振幅的条件。对于二维 Sinh-Gordon 模型,我们在耦合常数下微扰计算 celestial 振幅,并检查交叉性和幺正性条件对 celestial 振幅成立。将交叉性和幺正性条件施加于 celestial 振幅,我们想从低阶找到微扰理论中更高阶的振幅,即提供一个“原理证明”来表明我们可以将 bootstrap 思想应用于 celestial 振幅。我们发现施加交叉性和幺正性条件不足以对 celestial 振幅进行 bootstrap,存在一个额外的项,它不能由交叉性和幺正性条件确定。我们还研究了二维 QFT 中无质量粒子在 celestial 空间中的引力 dressing 条件,并看到对于引力 dressing 的 celestial 振幅,右半平面上的极点对于几种 ansatz 被消除。

英文摘要:

We explore celestial amplitude corresponding to $2d$ bulk $\mathcal{S}$-matrix. We consider scalar particles with identical mass and show that the celestial amplitude becomes the fourier transform of the $2d$ $\mathcal{S}$-matrix written in the rapidity variable. We translate the crossing and unitarity conditions into the conditions on the celestial amplitude. For the $2d$ Sinh-Gordon model, we calculate the celestial amplitude perturbatively in coupling constant and check that the crossing and unitarity conditions are satisfied for the celestial amplitude. Imposing the crossing and unitarity conditions to the celestial amplitude, we want to find amplitudes to the higher order in perturbation theory from the lower order i.e., to provide a "\textit{proof of principle}" to show we can apply the bootstrap idea to the celestial amplitude. We find that imposing the crossing and unitarity conditions is not enough for bootstrapping celestial amplitude, there is an extra term which can't be fixed by the crossing and unitarity conditions. We also study the gravitational dressing condition in $2d$ QFT for massless particles in celestial space and see that for the gravitationally dressed celestial amplitude, the poles on the right half-plane get erased for several ansatzes.

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