HET Seminar | Thomas Dumitrescu, UCLA | “2-Group Global Symmetries in Six Dimensions” | via Zoom

Mon, Nov 2, 2020, 2:30 pm
Location: 
via Zoom
Speaker(s): 

To join HET Seminar please click link below:

https://princeton.zoom.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09

Meeting ID: 985 9550 4817

Abstract: "I will review the notion of (continuous) 2-group global symmetries, which mix ordinary and higher-form global symmetries, and explain why they naturally arise in many 6d gauge theories. Most 6d SCFTs and little string theories have weakly-coupled infrared phases with gauge fields. While non-trivial 2-group symmetries are often present in little string theories, I will explain why they can never arise in unitary SCFTs. This observation can be used to establish a previously conjectured algorithm for computing ’t Hooft anomalies of such SCFTs. Finally, I will use this understanding to shed light on the a-theorem in six dimensions. In particular, I will show that all unitary 6d SCFTs have positive a-anomaly.”