近日，巴西圣保罗州立大学的Eggon Viana及其研究团队取得一项新进展。经过不懈努力，他们对β变形σ模型和强变形耦合极限进行研究。相关研究成果已于2024年9月19日在国际知名学术期刊《高能物理杂志》上发表。

该研究团队采用纯旋量形式，研究了在AdS₅ × S⁵中，对所有变形参数阶次的超弦β变形。这对于研究强变形参数区域是必要的，因为在场论方面，它与鱼网理论相关。

研究人员将纯旋量σ模型方法与先前已知的超引力描述进行了比较，并发现两者完全一致。此外，世界面模型的BRST结构为鱼网极限下，世界面模型的独特特征提供了自然解释。特别是，他们研究了σ模型拉格朗日量的简并性，并证明了BRST结构是导致鱼网σ模型特别“温和”简并的原因。

附：英文原文

Title: Beta deformed sigma model and strong deformation coupling limit

Author: Viana, Eggon

Issue&Volume: 2024-09-19

Abstract: We study the beta deformation of the superstring in AdS₅ × S⁵ at all orders in the deformation parameter, employing the pure spinor formalism. This is necessary in order to study the regime of strong deformation parameter, which in the field side is related to fishnet theories. We compare the pure spinor sigma model approach to the previously known supergravity description. We find a complete agreement. Moreover, the BRST structure of the worldsheet model provides a natural explanation of the peculiar features of the worldsheet model in the fishnet limit. In particular, we study the degeneracy of the sigma model Lagrangian. We show that the BRST structure is responsible for a particularly “tame” degeneration of the fishnet sigma-model.

DOI: 10.1007/JHEP09(2024)120

Source: https://link.springer.com/article/10.1007/JHEP09(2024)120