Fudan Student Workshop on Theoretical Physics 2025

Contribution List

1. 2D Kagome Antiferromagnets: Quantum Spin Liquids and beyond

轩哲 夏 (复旦大学)

2D strong correlated system has been a center topic in strong correlated electrons system for nearly a center. However, concrete understanding is obstacled by computational complexity and non-perturbative nature of quantum many body system. This talk focuses on 2D spin system with geometrical frustrations that forms a exotic state termed "Quantum Spin Liquid". Specifically on Kagome lattice,...

5. Bootstrapping Yang-Mills matrix integrals

歆然 苏

In this talk, we revisit the large $N$ limit of bosonic $D$-matrix Yang-Mills integrals using two complementary bootstrap methods.
In the positivity bootstrap, we obtain bounds for $\langle \text{Tr} XX \rangle$ and $\langle \text{Tr} XXXX \rangle$ at various length cutoff $L_{\max}$. The precision of some $L_{\max}=12$ islands is comparable to that of Monte Carlo estimates. For a fixed...

2. From UV to IR, tracking information loss in open quantum systems

Shi-Jia Lin (Fudan University, University of Chicago)

The unification of quantum information science and high energy physics has created a new experimental frontier, where understanding environmental decoherence is a critical challenge. We present a novel framework that, for the first time, formulates the problem of calculating decoherence of spin-spin correlation from final state radiation as a systematically improvable effective field theory...

6. Gauge Theories and Fiber Bundles

1) The basic mathematical framework of fiber bundles;
2) The correspondence between gauge symmetries and fiber bundle structures;
3) The application of fiber bundles in QED and QCD.​

3. Irregular states and surface defects in AGT correspondence

Yichi Zang (Fudan University)

We developed the analogue of Gaiotto-Whittaker state in 2d WZW CFT. In the generalized AGT correspondence, this theory is dual to the 4d Argyres-Douglas theories with codimension 2 defects. We evaluated the inner product of the irregular state with primary state, which should correspond to the partition function of AD theory with defect.

7. Noether's Theorem and Holographic Gravitational Anomaly

Zhe Feng (Institute of Theoretical Physics, Chinese Academy of Sciences)

In this work, we present a systematic study of asymptotic symmetries and conserved charges in Topological Massive Gravity(TMG) within asymptotically Anti-de Sitter($\mathrm{AdS}_3$) spacetimes. By rigorously applying Noether's theorem to the holographically renormalized action, we establish a robust framework that resolves long-standing ambiguities regarding boundary effects in the covariant...

4. superconducting quantum simulation for honeycomb model