I have beening trying my best to understand the notion of fields in Quantum field theory. Here are some questions that I have out of 100...(adsbygoogle = window.adsbygoogle || []).push({});

1)What is the conceptual way of understanding the locality of fields?

2)How to calculate fields?(in dim 2 case)

3)Will the calculation depends on the worldsheet metric or signature?

For 2), why the following calculation is wrong?

In dim 1 case(only time parameter), since field must satisfy the field equation, so it should look like: exp(itH)Oexp(-itH) where H is the hamiltonian from time translation invariance.

Thus in dim 2 case, the field should be: exp(isP)exp(itH)Oexp(-itH)exp(-isP) where P comes from the translation invariance in the circle direction.

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# A question about fields

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