郭斌  副教授学术报告

Title: Near-gap spectrum in the D1D5 CFT

Speaker: Bin Guo (郭斌)

Affiliation: Central South University（中南大学）

Time: 16:00-17:00, Friday, 12th June, 2026 (UTC+8, Beijing Time)

Venue: Room 1502, Shing-Tung Yau Center, Sipailou Campus of Southeast University（东南大学四牌楼校区丘成桐中心1502室）

Inviter: Qiang Wen（文强）

Abstract

The spectrum of the free D1D5 CFT has a $1/N$ gap above the Ramond ground states, arising from the maximally twisted sector. A natural question is whether this gap is an artifact of the free theory or remains robust in the black hole regime. In this talk, I will present the spectrum of near-gap states away from the free point. In the large $N$ limit, the near-gap spectrum can be determined up to order $1/N^2$ using an integrable structure. We find that the gap and the near-gap spectrum remain robust away from the free point. I will also discuss possible implications for the mass gap of near-BPS black holes.

Speaker

Bin Guo (郭斌) is an associate professor at Central South University. He obtained his Ph.D. from The Ohio State University, followed by postdoctoral positions at IPhT Paris-Saclay and ETH Zürich. His research interests are black hole microstates and related topics.