🌐EnglishEnglishDeutschEspañolItalianoPortuguês한국어中文EntityQ1048763· pop 7· linked from 180 articlesPolyakov actionaction describing the worldsheet of a string in string theoryAvailable in 7 languagesEspañolDeutsch中文PortuguêsItaliano한국어via Wikidata sitelinks · CC0Connectionshistory of string theoryEntitynon-linear sigma modelEntityCategoriesConformal field theoryString theory