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Written by Vanessa on 2024-09-18 at 23:30

New blog post: How to integrate out a particle

Let's suppose we are not interested in the interactions of one specific particle in a QFT. We can "integrate it out" - i.e. we build a new theory that lacks this particle, but that implicitly includes the effects of the missing particle such as loop terms or mediated interactions.

For me, it was pretty surprising how beautifully this turns out in terms of Feynman diagrams when you do it systematically, so I made a blog post about it.

https://ash64.eu/blog/2024/integrating-out-particles.pdf

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