I was looking through some problems on QFT, and I found these exercises:(adsbygoogle = window.adsbygoogle || []).push({});

http://www.damtp.cam.ac.uk/user/tong/qft/oh4.pdf

I was wondering about questions 9 and 10...

Q9 : speaking I guess aftermatch ,why was there a factor of 2 wrong in the published result? To be honest I don't quiet understand the question posed by Pauli, was he asking for something like: [itex]\gamma \rightarrow \phi \phi[/itex] or [itex] \gamma \gamma \rightarrow \phi \phi[/itex] or even [itex]\phi \phi ( \rightarrow \gamma \rightarrow ) \phi \phi[/itex]?

Q10: any hint for why classical physicists hadn't introduced fields for the particles like electrons? was that because QM and wavefunctions were not existent at that time?

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# A Some fun (yet nice) questions on QFT

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