#  Seminar: Dan Freed (University of Texas): "What is an anomaly?" 

 



####  calendar\_today Date and Time 

 **February 7, 2023** 

 09:30AM - 09:30AM EST 

####  pin\_drop Location 

 **https://harvard.zoom.us/j/779283357?pwd=MitXVm1pYUlJVzZqT3lwV2pCT1ZUQT09**  



 

 



 

 **![Dan Freed](/sites/g/files/omnuum6611/files/styles/hwp_1_1__360x360_scale/public/mathpicture/files/dan_freed.jpg?itok=GzRsQjJj) 

 

  
Speaker:** Dan Freed (University of Texas)  
**Title:** What is an anomaly?  
**Abstract:** Anomalies in quantum field theory have been the subject of attention for decades. In this talk I will dispel some myths: anomalies are tied to symmetry, anomalies are tied to fermionic fields, etc. Then I will explain how anomalies--expressed as invertible field theories--are the manifestation of the projectivity of quantum field theory. My point of view is summarized by a slogan: Quantum theory is projective. Quantization is linear.

 

 

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 Attachments- [  picture\_as\_pdf  23-2-7\_dan\_freed\_seminar.pdf ](/sites/g/files/omnuum6611/files/mathpicture/files/23-2-7_dan_freed_seminar.pdf)
 
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