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- One-loop_Feynman_diagram abstract "In physics, a one-loop Feynman diagram is a connected Feynman diagram with only one cycle (unicyclic). Such a diagram can be obtained from a connected tree diagram by taking two external lines of the same type and joining them together into an edge.Diagrams with loops (in graph theory, these kinds of loops are called cycles, while the word loop is an edge connecting a vertex with itself) correspond to the quantum corrections to the classical field theory. Because one-loop diagrams only contain one cycle, they express the next-to-classical contributions called the semiclassical contributions.One-loop diagrams are usually computed as the integral over one independent momentum that can "run in the cycle". The Casimir effect, Hawking radiation and Lamb shift are examples of phenomena whose existence can be implied using one-loop Feynman diagrams, especially the well-known "triangle diagram":File:Triangle diagram.svgThe evaluation of one-loop Feynman diagrams usually leads to divergent expressions, which are either due to zero-mass particles in the cycle of the diagram (infrared divergence) or due to insufficient falloff of the integrand for high momenta (ultraviolet divergence). The former are usually dealt with by assigning the zero mass particles a small mass λ, evaluating the corresponding expression and then taking the limit , the latter are dealt with in the renormalization program.The one-loop corrections lead to the following effective action:".
- One-loop_Feynman_diagram thumbnail Triangle_diagram.svg?width=300.
- One-loop_Feynman_diagram wikiPageID "700131".
- One-loop_Feynman_diagram wikiPageRevisionID "520481612".
- One-loop_Feynman_diagram auto "yes".
- One-loop_Feynman_diagram date "December 2009".
- One-loop_Feynman_diagram hasPhotoCollection One-loop_Feynman_diagram.
- One-loop_Feynman_diagram subject Category:Diagrams.
- One-loop_Feynman_diagram subject Category:Quantum_field_theory.
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- One-loop_Feynman_diagram type Creation103129123.
- One-loop_Feynman_diagram type Diagram103186399.
- One-loop_Feynman_diagram type Diagrams.
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- One-loop_Feynman_diagram type Representation104076846.
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- One-loop_Feynman_diagram comment "In physics, a one-loop Feynman diagram is a connected Feynman diagram with only one cycle (unicyclic). Such a diagram can be obtained from a connected tree diagram by taking two external lines of the same type and joining them together into an edge.Diagrams with loops (in graph theory, these kinds of loops are called cycles, while the word loop is an edge connecting a vertex with itself) correspond to the quantum corrections to the classical field theory.".
- One-loop_Feynman_diagram label "One-loop Feynman diagram".
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- One-loop_Feynman_diagram sameAs Q7092319.
- One-loop_Feynman_diagram sameAs Q7092319.
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- One-loop_Feynman_diagram wasDerivedFrom One-loop_Feynman_diagram?oldid=520481612.
- One-loop_Feynman_diagram depiction Triangle_diagram.svg.
- One-loop_Feynman_diagram isPrimaryTopicOf One-loop_Feynman_diagram.
