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Perturbation Theory Articles

Tag Archive for: perturbation theory

What are virtual particles

Virtual Particles Explained — Quantum Field Theory

February 18, 2019
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1 Comment
Definition / Summary Virtual particles are a mathematical device used in perturbation expansions of the S-operator (transition matrix) for interactions…
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Learn Interacting Quantum Fields in Mathematical Quantum Field Theory

January 29, 2018
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9 Comments
This is one chapter in a series on Mathematical Quantum Field Theory.The previous chapter is 14. Free quantum fields.The next chapter is 16. Renormalization. 15.…
https://www.physicsforums.com/insights/wp-content/uploads/2017/10/qft_quantumfields.png 135 240 Urs Schreiber https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png Urs Schreiber2018-01-29 01:34:392026-06-07 06:47:45Learn Interacting Quantum Fields in Mathematical Quantum Field Theory
perturbation

Introduction to Perturbative Quantum Field Theory

September 12, 2017
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110 Comments
This is the beginning of a series that gives an introduction to perturbative quantum field theory (pQFT) on Lorentzian spacetime backgrounds in its…
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perbation theory

Introduction to Causal Perturbation Theory

June 7, 2015
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30 Comments
Relativistic quantum field theory is notorious for the occurrence of divergent expressions that must be renormalized by recipes that on first sight sound…
https://www.physicsforums.com/insights/wp-content/uploads/2015/06/perbationt.png 135 240 Arnold Neumaier https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png Arnold Neumaier2015-06-07 19:40:532023-10-03 04:14:19Introduction to Causal Perturbation Theory
renormalization2

Why Renormalisation in Quantum Theory Needs a Cutoff

May 24, 2015
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31 Comments
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…
https://www.physicsforums.com/insights/wp-content/uploads/2015/05/renormalization2.png 135 240 Bill Hobba https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png Bill Hobba2015-05-24 11:59:412021-04-17 09:03:14Why Renormalisation in Quantum Theory Needs a Cutoff

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