(2025-01-22) Seminar: Dongsheng Ge -- Localized RG flows on composite defects and C-theorem

时间:2025-01-21浏览:10

Title: Localized RG flows on composite defects and C-theorem

Speaker: Dongsheng Ge (葛东胜)

Affiliation: Osaka University, Japan (日本大阪大学)

Time: 14:00-15:00, Wednesday, January 22nd, 2025 (UTC+8, Beijing Time)

Venue: Zoom Meeting (ID: 385 442 0225; Passcode: yauc)

Inviter: Yunfeng Jiang (江云峰)


Abstract

We consider a composite defect system where a lower-dimensional defect (sub-defect) is embedded to a higher-dimensional one, and examine renormalization group (RG) flows localized on the defect. A composite defect is constructed in the (3 − ϵ)-dimensional free O(N) vector model with line and surface interactions by triggering localized RG flows to non-trivial IR fixed points. Focusing on the case where the symmetry group O(N) is broken to a subgroup O(m) × O(N − m) on the line defect, there is an O(N) symmetric fixed point for all N, while two additional O(N) symmetry breaking ones appear for N ≥ 23. We also examine a C-theorem for localized RG flows along the sub-defect and show that the C-theorem holds in our model by perturbative calculations. This talk is based on arXiv:2408.04428.

  

Speaker

Dr. Dongsheng Ge is a postdoc researcher at Osaka University. He obtained his PhD from Ecole Normale Superieure de Paris and pursued a postdoc in the University of Warsaw after that. His research interests lie in the intersection of holography, quantum information and quantum many-body systems. Currently, his research focuses on understanding new types of defects from field-theory perspective.


The seminar will be broadcasted online by Zoom. 

Interested people are free to join, without registration in advance.



The Zoom info is

URL: https://us02web.zoom.us/j/3854420225?pwd=SXY4eWJKOTBFZWJDaE16aXpTamY1QT09

Meeting ID: 385 442 0225

Passcode: yauc


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