In physics, an infrared divergence (also IR 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. == Overview == The infrared divergence only appears in theories with massless particles (such as photons).
In physics, an infrared divergence (also IR 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. == Overview == The infrared divergence only appears in theories with massless particles (such as photons).
Source: Wikipedia "Infrared divergence" · CC BY-SA 4.0
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