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asimov42

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- TL;DR Summary
- Clarifications on interactions between fields in QFT...

Following up on @A. Neumaier's excellent series of articles on virtual particles, I'm confused about one thing (well of of several). If you pop over to the discussion of virtual particles on Matt Strassler's page, he mentions that, for example, an excitation in the photon (em) field will also induce a disturbance in the electron field, etc. This is all well and good (although he seems to illustrate things with single Feynman diagrams - not so good as he never mentions that you have an infinite number of such diagrams), but...

Since all fields are quantized, isn't the minimum possible disturbance you can induce in the electron field equivalent to an electron? Or once you have a fully interacting picture, does this change (realized that the notion of a 'particle' may not be well defined)?

Since all fields are quantized, isn't the minimum possible disturbance you can induce in the electron field equivalent to an electron? Or once you have a fully interacting picture, does this change (realized that the notion of a 'particle' may not be well defined)?