# Kramers-Wannier-like duality defects in (3+1)d gauge theories

- Institution: CERN
- Department: TH String Theory Seminar
- Speaker: Justin Kaidi
- Year: 2022
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3008650)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

I will introduce a class of non-invertible topological defects in (3+1)d gauge theories whose fusion rules are the higher-dimensional analogs of those of the Kramers-Wannier defect in the (1+1)d critical Ising model. As in the lower-dimensional case, the presence of such non-invertible defects implies self-duality under a particular gauging of the discrete (higher-form) symmetries. I will illustrate this by means of the example of SO(3) Yang-Mills (YM) at θ=π, as well as SU(2)N=4 SYM at τ=i.

String Seminars: https://cern.zoom.us/j/61053603623?pwd=THhlNnU4ZXljQjFxMjVwQlVxVHdQZz09.

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## Lectures

1. [Kramers-Wannier-like duality defects in (3+1)d gauge theories](https://invisiblenetwork.ai/learn/cern/3008650/63e62745ad6b), 1 h 7 min (CERN's player)