Gaudin
Gaudin refers to a family of exactly solvable quantum spin models, commonly known as Gaudin magnets, named after Michel Gaudin who introduced them in the 1970s. The models describe N spins located at distinct sites with long-range interactions whose strength scales inversely with the difference of site parameters z_i. A typical set of Gaudin Hamiltonians is given by H_i = sum_{j≠i} (S_i · S_j)/(z_i - z_j), with the property that all H_i commute, making the system integrable.
The integrability of Gaudin models is underpinned by the Gaudin algebra, which arises from a quasi-classical
Connections and applications extend beyond spin chains. The Gaudin model is linked to the Knizhnik-Zamolodchikov equations
Origin and usage: the term Gaudin magnets appears in physics literature to denote this class of integrable