-

2D CFTs defined by screeening charges and dual description of 2D deformed integrable sigma models

组织者

李淇明

演讲者

Mikhail Alfimov

时间

2025年01月16日 14:00 至 15:30

地点

A3-4-301

线上

Zoom 462 110 5973 (BIMSA)

摘要

There exist several known examples of integrable deformations of 2D sigma models, which admit so-called dual description in terms of Toda-like theories. To extend this description we study CFTs defined by the system of screening charges depending on the continuous parameter b. Supplemented by additional screening charges, this system defines a QFT, which corresponds to the certain Toda QFT in the limit b to 0 and to the deformed sigma model in the limit b to infinity. This can be shown by comparing the two-particle scattering matrix to the corresponding trigonometric solution of the Yang-Baxter equation in th first case. In the second case we examine the deformed sigma model RG flow and show that it is consistens with the screening charges of the theory. We illustrate the above description with the examples of O(N) and OSp(N|2m) theories.

演讲者介绍

Mikhail Alfimov received his PhD at Ecole Normale Superieure Paris in 2018 under the supervision of Prof. Vladimir Kazakov and Prof. Gregory Korchemsky. Currently he is an Associate Professor at the HSE University and Moscow Engineering-Physical Institute and a Research Fellow at the P.N. Lebedev Physical Institute of the Russian Academy of Sciences. His research is concentrated on the study of integrable quantum field theories, especially sigma models.