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- Thread starter preet0283
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I would recommend that you first gain an understanding of the classical field before you attempt to learn about a quantum system which reduces to a classical field theory in a certain limit (which is what QFT is; see 't Hooft's piece on the "conceptual basis for QFT" for further details).

Classical field theory is the generalisation of a system with finite degrees to one with infinite degrees of freedom. This is why we replace co-ordinates with a (usually) function; we have a Lagrangian density [itex]{\cal L}[/itex] (which is a scalar) and we try and extremize the action given by this Lagrangian so that:

[tex]\delta \frac{1}{c}\int{\cal L} d^4\vec{x} = 0[/tex]

and this procedure generates field equations.

Getting to QFT is a lot more complicated, and I would recommend firstly 't Hooft's work as a brief introduction and then to dive into one of the several texts on the topic.

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- #4

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Essentially what I'm trying to say (and doing so badly) is that you'll have to ask someone else.

- #5

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I find Mandl and Shaw and good reference.

chrs.

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