David Berenstein  教授学术报告

Title: Spin chains from large N QCD at strong coupling

Speaker: David Berenstein

Affiliation: University of California at Santa Barbara, USA（美国加州大学圣塔芭芭拉分校）

Time: 16:00-17:00, Friday, April 3rd, 2026 (UTC+8, Beijing Time)

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

Inviter: Yunfeng Jiang （江云峰）

Abstract

I will explain why studying the strong coupling expansion of large N QCD might be a viable way to address problems related to QCD dynamics. In particular, the strict large N strong coupling predicts that the dynamics is that of a gas of non-interacting loops, and that for each such (open) loop one can encode the state using word directions on how to go from a starting point to an end point. I will show that thinking this way naturally leads one to study some spin chain systems similar to those that arose in the study of N=4 SYM. Some subsectors of the spin chain are found to be integrable at the first order correction, but the most general sector is non-integrable. I will state some of the challenges ahead, particularly when it comes to better understanding the roughening transition. This is a transition one must go through before getting to the continuum limit.

Speaker

David Berenstein is a theoretical physicist and professor at University of California, Santa Barbara, USA. He received his Ph.D. from University of Texas, Austin in 1998 under the supervision of Willy Fischler, coauthor of matrix theory. He was a visiting scholar at the Institute for Advanced Study from 2001 to 2004 and again in the fall of 2010.

His research mainly concerns string theory. He has made notable contributions to the theory of AdS/CFT conjecture—for example, in 2002 regarding the duality between strings on pp-wave spacetime and Berenstein–Maldacena–Nastase operators in N=4 supersymmetric Yang-Mills theory, together with Juan Maldacena and Horațiu Năstase, and more recently (since 2004) on the matrix model of BPS (Bogomol'nyi–Prasad–Sommerfield bound) states in N=4 supersymmetric Yang-Mills theory.

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