After a very long delay and lots of hand-wringing, I’ve posted a new article in the physics for mathematicians series about free fields in quantum field theory. More than any other article in this series I am posting this one without being completely satisfied with the quality of the exposition, but it’s been long enough that I thought it was better to stop delaying and just get it out there, flaws and all. If anyone happens to be reading this who has any suggestions for how it could be improved, I’m very happy to listen!

I’ve been very bad at guessing how long this series will take to write, but my current plan is that the next thing I post will be a direct continuation of the QFT story. As always, let me know if you have any ideas for something you’d like to see.