Infrared fixed point
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In physics, an infrared fixed point is a fixed point obtained by probing the very long-distance behavior of the renormalization group, e.g. if the length-scale increases and the physical coupling constants approach a fixed value, then that fixed value of the coupling constant is the infrared fixed point. The opposite instance, e.g. if the length-scale decreases and the physical coupling constants approach a fixed value, is an ultraviolet fixed point. In the statistical physics of phase transitions, an infrared fixed point determines the properties of the critical point.
IR fixed points may be trivial or nontrivial. An example of the latter is the Banks-Zaks fixed point.
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