🌐EnglishEnglishDeutschFrançaisItalianoPortuguêsРусский한국어中文日本語EntityQ924571· pop 9· linked from 187 articlesnon-linear sigma modelAlso known as nonlinear sigma model, nonlinear σ-model, non-linear σ modelclass of quantum field theory modelsAvailable in 9 languagesFrançais中文日本語РусскийPortuguêsCatalanPunjabiUkrainianvia Wikidata sitelinks · CC0Connectionshistory of string theoryEntitystring theoryEntityCategoriesMathematical physicsMurray Gell-MannQuantum field theory