Fudan Student Workshop on Theoretical Physics 2025

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,...

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...

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...

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.

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.

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...