Examining my copy of Heisenberg's 1966 Interscience text "introduction to the unified field theory of elementary particles", he describes how for free-particles one can use linear field theory based on the klein-gordon equation but because this is the IN or OUT of the S matrix theory it's not very useful, and we need a non-linear field equation to solve the collision dynamics.(adsbygoogle = window.adsbygoogle || []).push({});

BUT has anybody got some on-line references to the linear theory i can use please?

i'm chasing down the self-field avenue and want to compare apples and oranges if i can

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# Self-field theory compared with collision theory

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