In the first half of the talk, I will review the notion of
non-invertible symmetries and how they help us to analyze certain
strongly coupled QFTs like 2d Adjoint QCD. Then, I discuss the
representation theory of non-invertible symmetries and use
it...
Astronomical observations indicate that coherent, dynamically
important magnetic fields are ubiquitous in the Universe. However,
neither the origin problem -- what are the physical mechanisms that
generate the initial ``seed'' magnetic fields —- nor...