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- Thread starter clerk
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In renormalized perturbation theory, we split our lagrangain into a lagrangian with the same form but renormalized parameters and counterterms. The values of these renormalized parameters are set by renormalization conditions which can be chosen.

The distinction is in perturbation theory. Instead of expanding the observables we wish to calculate into a power series in the bare parameters we do it in the renormalized parameters.

The renormalized parameters are usually more closely related to physical quantities and the renormalization condition (i.e., mostly energy scale) may be chosen so perturbation theory works better.

Hope that helps

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I am still confused about the coefficients of the counterterms ..how are they fixed?

- #4

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The counterterms are fixed order by order, using the renormalization conditions.

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