标题： 弦理论中解耦极限的世界面形式主义 显示英文标题

标题： Worldsheet Formalism for Decoupling Limits in String Theory

摘要： 我们研究了IIA超弦理论的解耦极限中的玻色子部分，其中背景Ramond-Ramond一形式被微调到其临界值，从而抵消了相关的背景D0膜张力。 在这一临界极限中，轻激发态是D0膜，其动力学由Banks-Fischler-Shenker-Susskind（BFSS）矩阵理论描述，该理论对应于离散光锥量化（DLCQ）下的M理论。 我们开发了相同临界极限下IIA超弦理论中基本弦的世界面形式。 我们表明，基本弦在其世界面上会出现奇点，其拓扑结构如 ambitwistor 弦理论中所述，由节点黎曼球面描述。 我们研究了该弦sigma模型的T对偶变换，并提供了一个世界面推导，用于最近重新提出并扩展的统一II型超弦理论中各种解耦极限的对偶性网络。 通过匹配弦的世界面作用量，我们展示了这些解耦极限如何与无张力（以及ambitwistor）弦理论、Carrollian弦理论、AdS/CFT对应关系的自旋矩阵极限等相互关联。 显示英文摘要

摘要： We study the bosonic sector of a decoupling limit of type IIA superstring theory, where a background Ramond-Ramond one-form is fined tuned to its critical value, such that it cancels the associated background D0-brane tension. The light excitations in this critical limit are D0-branes, whose dynamics is described by the Banks-Fischler-Shenker-Susskind (BFSS) Matrix theory that corresponds to M-theory in the Discrete Light-Cone Quantization (DLCQ). We develop the worldsheet formalism for the fundamental string in the same critical limit of type IIA superstring theory. We show that the fundamental string develops singularities on its worldsheet, whose topology is described by nodal Riemann spheres as in ambitwistor string theory. We study the T-duality transformations of this string sigma model and provide a worldsheet derivation for the recently revived and expanded duality web that unifies a zoo of decoupling limits in type II superstring theories. By matching the string worldsheet actions, we demonstrate how some of these decoupling limits are related to tensionless (and ambitwistor) string theory, Carrollian string theory, the Spin Matrix limits of the AdS/CFT correspondence, and more.