近日，法国巴黎萨克雷大学的Jakub Vosmera及其研究团队取得一项新进展。经过不懈努力，他们对体诱导的D膜变形和弦耦合常数进行了研究。相关研究成果已于2024年10月15日在国际知名学术期刊《高能物理杂志》上发表。

该研究团队考虑计算开闭弦场论的壳上圆盘作用量，作为一种规范不变的方法，来捕捉由 体 CFT（共形场论）变形引起的D膜张力的变化。

他们研究了体物质变形（包括边际变形和相关变形）在多种CFT的多种边界条件下，对微扰理论中次主阶（两回路）的影响。在所有分析的例子中，研究人员发现物质边界态的g函数的变化，总是伴随着弦耦合常数的一个与边界无关的变化，其主导行为普遍与变形体算符的球面两点函数成正比。

附：英文原文

Title: Bulk-induced D-brane deformations and the string coupling constant

Author: Maccaferri, Carlo, Ruffino, Alberto, Vosmera, Jakub

Issue&Volume: 2024-10-15

Abstract: We consider computing the on-shell disk action of open-closed string field theory as a gauge-invariant way of capturing the shift in D-brane tension that is induced by a deformation of the bulk CFT. We study the effect of bulk matter deformations (both marginal and relevant) on a wide range of boundary conditions in a number of CFTs up to subleading (two-loop) order in perturbation theory. In all analyzed examples, we find that the shift in the g-function of the matter boundary state is always accompanied by a boundary-independent shift in the string coupling constant, whose leading behaviour is universally proportional to the sphere two-point function of the deforming bulk operator.

DOI: 10.1007/JHEP10(2024)115

Source: https://link.springer.com/article/10.1007/JHEP10(2024)115