Timeline for Why is the free field operator the same with interactions present?
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| Jul 13, 2015 at 14:51 | comment | added | Prof. Legolasov | I think what you are looking for is called the LSZ reduction formalism. However it is rather phenomenological (since it assumes assymptotical states). As far as I know, there is no rigorous approach to this problem (mathematically, interaction picture in QFT does not even exist). Probably the best thing to do here is to accept the LSZ formalizm (despite its obvious flaws) as one that describes scattering correctly (when the coupling is small) and to forget about this issue, focusing on computing time-ordered operator product expectations. | |
| Jul 12, 2015 at 14:13 | answer | added | yuggib | timeline score: 5 | |
| Jul 12, 2015 at 13:03 | comment | added | jinawee | @Prahar Could you elaborate? Why isn't position dependece affected by the interaction? | |
| Jul 12, 2015 at 13:00 | history | edited | jinawee | CC BY-SA 3.0 |
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| Jul 12, 2015 at 12:54 | history | edited | jinawee | CC BY-SA 3.0 |
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| Jul 12, 2015 at 12:53 | comment | added | Prahar | Your point number 1 is correct. | |
| Jul 12, 2015 at 12:49 | history | asked | jinawee | CC BY-SA 3.0 |