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- Q3032223 subject Q7036088.
- Q3032223 subject Q8652932.
- Q3032223 abstract "In physics, an infrared divergence or infrared catastrophe is a situation in which an integral, for example a Feynman diagram, diverges because of contributions of objects with very small energy approaching zero, or, equivalently, because of physical phenomena at very long distances.The infrared (IR) divergence only appears in theories with massless particles (such as photons). They represent a legitimate effect that a complete theory often implies. One way to deal with it is to impose an infrared cutoff and take the limit as the cutoff approaches zero and/or refine the question. Another way is to assign the massless particle a fictitious mass, and then take the limit as the fictitious mass vanishes.The divergence is usually in terms of particle number and not empirically troubling, in that all measurable quantities remain finite. (Unlike in the case of the UV catastrophe where the energies involved diverge.)".
- Q3032223 wikiPageWikiLink Q1047702.
- Q3032223 wikiPageWikiLink Q1111.
- Q3032223 wikiPageWikiLink Q11379.
- Q3032223 wikiPageWikiLink Q1203669.
- Q3032223 wikiPageWikiLink Q1399710.
- Q3032223 wikiPageWikiLink Q2024141.
- Q3032223 wikiPageWikiLink Q234881.
- Q3032223 wikiPageWikiLink Q3032228.
- Q3032223 wikiPageWikiLink Q3198.
- Q3032223 wikiPageWikiLink Q386272.
- Q3032223 wikiPageWikiLink Q413.
- Q3032223 wikiPageWikiLink Q51501.
- Q3032223 wikiPageWikiLink Q556977.
- Q3032223 wikiPageWikiLink Q653850.
- Q3032223 wikiPageWikiLink Q655904.
- Q3032223 wikiPageWikiLink Q7036088.
- Q3032223 wikiPageWikiLink Q7554013.
- Q3032223 wikiPageWikiLink Q80091.
- Q3032223 wikiPageWikiLink Q8652932.
- Q3032223 comment "In physics, an infrared divergence or infrared catastrophe is a situation in which an integral, for example a Feynman diagram, diverges because of contributions of objects with very small energy approaching zero, or, equivalently, because of physical phenomena at very long distances.The infrared (IR) divergence only appears in theories with massless particles (such as photons). They represent a legitimate effect that a complete theory often implies.".
- Q3032223 label "Infrared divergence".