Joint Uppsala/Stockholm Seminar (in Stockholm): 11.15 Andrea Grigoletto (Uppsala University), 14.45 Sridip Pal (IHES, Paris)

Tuesday 14 Apr 2026, 10:00 → 16:00 Europe/Stockholm

Albano Building 3

11.15: Andrea Grigoletto (University of Uppsala) - From higher representations to higher spin-statistics

Abstract: 

In recent years, the study of generalized symmetries has led to a systematic understanding of the symmetry charges carried by extended operators in QFTs, together with the algebraic structures and kinematic constraints they encode. The corresponding treatment of spacetime symmetries, however, remains much less developed. In this talk I will outline the framework underlying these results, emphasizing its close connection with fully extended TQFTs, and then explain how it can be extended to incorporate (stable) spacetime tangential symmetries. This leads us to a higher spin-statistics principle, extending the usual spin-statistics relation to operators of arbitrary dimension and predicting, for instance, a Z/24 classification of statistics for surface operators. Based on WIP w/ D. Brennan. 

 

14.45: Sridip Pal (IHES Paris) - Quantifying Strong Symmetry Breaking with Resource Theory

Abstract: In this talk, I will introduce a resource-theoretic framework to quantify the amount of strong symmetry breaking. Resource theory provides an axiomatic way to define and test candidate measures, for example, by requiring monotonicity under symmetric operations. Within this framework, I will discuss several quantifiers of strong symmetry breaking, which can be viewed as strong analogues of entanglement asymmetry, a widely used quantifier of weak symmetry breaking, satisfying the monotonicity condition (as opposed to the second Rényi entanglement asymmetry, which fails this criterion). I will conclude with explicit examples where these quantities can be computed analytically. Based on arXiv:2601.20924 [hep-th] with Yuya Kusuki and Hiroyasu Tajima.