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Answer by Holographer for Why renormalizable theory is useful?
Firstly, renormalisation isn't really inherently to do with the UV divergences you get: it's more to do with the idea that interactions with other fields change a particle's energy from its inherent...
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Why renormalizable theory is useful? I want to know detail reason for above question. At a glance, I know following things.In quantum field theory, $i.e$ computing self-energy(or self-interaction)...
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