Eikonal approximation in celestial CFT

Eikonal approximation in celestial CFT
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天体 CFT 中的 Eikonal 近似

DOI:
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发表时间:
2022
影响因子:
5.4
通讯作者:
A. Raclariu
A. Raclariu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lei Gioia Yang;A. Raclariu

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我们在天体CFT_2中发现了一个由t通道交换主导的无质量2-2散射的eikonal区域。我们导出了一个天体振幅的公式,该公式将任意整数自旋的交换恢复到耦合中的所有阶。由此产生的椭圆相位采用与平面空间相同的形式,质心能量的幂被天球上的重量移动算子所取代。我们独立计算了一个标量在激波背景下传播时的天体两点函数,结果表明,在引力耦合的领先顺序和源的适当选择下,结果与引力子交换天体eikonal公式的预测一致。我们证明了这个两点函数可以在平坦空间极限下由AdS_4中的相应公式直接得到。最后建立了天体CFT_ d−1中标量天体振幅与标量AdS_ d +1 Witten图的平面空间极限之间的一般关系。
We identify an eikonal regime in celestial CFT_2 in which massless 2-2 scattering is dominated by t-channel exchange. We derive a formula for the celestial amplitude that resums exchanges of arbitrary integer spin to all orders in the coupling. The resulting eikonal phase takes the same form as in flat space with the powers of center-of-mass energy replaced by weight-shifting operators on the celestial sphere. We independently compute the celestial two-point function for a scalar propagating in a shockwave background and show that to leading order in the gravitational coupling and for a suitable choice of the source, the result agrees with the prediction from the celestial eikonal formula for graviton exchange. We demonstrate that this two-point function can be directly obtained from the corresponding formula in AdS_4 in a flat space limit. We finally establish a general relation between scalar celestial amplitudes in celestial CFT_ d− 1 and the flat space limit of scalar AdS_ d +1 Witten diagrams.
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