Perturbation Theory Articles

Tag Archive for: perturbation theory

perbation theory

Introduction to Causal Perturbation Theory

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Relativistic quantum field theory is notorious for the occurrence of divergent expressions that must be renormalized by recipes that on first sight sound…
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Why Renormalisation in Quantum Theory Needs a Cutoff

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Introduction This is a follow on from my paper explaining renormalization. A question was raised - why exactly do we need a cut-off. There is a deep reason…