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Demystifier said:
In QED, it seems that all measurable effects can be well described by the good old perturbative methods, meaning that there is no practical need for something like that. But I could be wrong.

And do you know if those methods can be used for many body problems?

Thanks for your reply.
 
jonjacson said:
And do you know if those methods can be used for many body problems?
If you mean for strongly-correlated systems such as high-Tc superconductivity, I would say that they can be used in principle, but that in practice they are not very efficient.
 
Demystifier said:
If you mean for strongly-correlated systems such as high-Tc superconductivity, I would say that they can be used in principle, but that in practice they are not very efficient.

Ok, so basically they are neither efficient nor necessary.