近日，德国马克斯-普朗克物理研究所Stieberger, Stephan团队提出了高能弦理论和天球。这一研究成果发表在2025年9月4日出版的《高能物理杂志》上。

研究组详细阐述了与平坦时空全息的弦世界表连接。更具体地说，在平坦背景下树级弦散射的高能（零张力）极限下，底层弦世界表可以与天球相关联，高能弦描述的鞍点代表天球上的点。研究组证明，这幅图在围绕这个经典构型的量子涨落的所有次阶上仍然成立。

因此，弦理论的高能极限有双重描述，即由（光）高自旋模式组织的天球上的大能量膨胀。这种方法通过将天体共形场论（CFT）与弦理论的（自由）世界表CFT联系起来，指出了天体共形场论（CFT）的内在构造。研究组还详细阐述了树级开弦和闭弦振幅的高能表示，并计算了它们的子导校正。讨论了它们的数论性质及其作为无张力弦幅值的相关性。

附：英文原文

Title: High energy string theory and the celestial sphere

Author: Kervyn, Xavier, Stieberger, Stephan

Issue&Volume: 2025-09-04

Abstract: We elaborate on a string world-sheet connection to flat space-time holography. More specifically, in the high energy (zero tension) limit of tree-level string scattering in flat backgrounds the underlying string world-sheets can be related to the celestial sphere, with the saddle points of the high energy string description representing points on the celestial sphere. We show that this picture continues to hold at all subleading orders in the quantum fluctuations around this classical configuration. As a consequence there is a dual description of the high energy limit of string theory as the large energy expansion on the celestial sphere organized by (light) higher spin modes. This approach points to an intrinsic construction of celestial conformal field theory (CFT) by relating it to a (free) world-sheet CFT of string theory. We also elaborate on the high energy representations of tree-level open and closed string amplitudes and work out their subleading corrections. Their number theoretic properties and relevance as amplitudes of tensionless strings are discussed.

DOI: 10.1007/JHEP09(2025)044

Source: https://link.springer.com/article/10.1007/JHEP09(2025)044