Remarks on the two-point string amplitudes

被引：3
|
作者：
Giribet, Gaston [1 ]
Labranche, Nicholas [1 ]
La Madrid, Joan [1 ]
机构：
[1] NYU, Dept Phys, 726 Broadway, New York, NY 10003 USA
来源：
PHYSICAL REVIEW D | 2023年 / 107卷 / 10期
关键词：
D O I：
10.1103/PhysRevD.107.106021
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The two-point string amplitude at tree level in flat spacetime reproduces the expected expression for free particles. This has been proven by Erbin et al. in [J. High Energy Phys. 07 (2019) 139.] by two methods. Here, we provide an alternative proof of this result. Our method consists in considering a timelike Liouville direction as a regularization parameter, which suffices to break time translation invariance and, at the same time, to stabilize the residual conformal symmetry in the worldsheet. This allows taking a limit and restoring Poincare ' symmetry in a controlled way, thus reproducing the correct expression of the two-point amplitude.
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页数：8
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