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Conformal symmetry
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===Conformal field theory=== {{Main|Conformal field theory}} In relativistic quantum field theories, the possibility of symmetries is strictly restricted by [[Coleman–Mandula theorem]] under physically reasonable assumptions. The largest possible global [[symmetry group]] of a non-[[supersymmetry|supersymmetric]] [[Fundamental interaction|interacting]] [[quantum field theory|field theory]] is a [[direct product of groups|direct product]] of the conformal group with an [[internal group]].<ref>{{Cite journal | doi = 10.1088/1751-8113/46/21/214011 | volume = 46 | issue = 21 | pages = 214011 | author = Juan Maldacena |author2=Alexander Zhiboedov | title = Constraining conformal field theories with a higher spin symmetry | journal = Journal of Physics A: Mathematical and Theoretical | date = 2013 | url = http://inspirehep.net/search?p=recid:1079967&of=hd |bibcode = 2013JPhA...46u4011M | arxiv = 1112.1016 | s2cid = 56398780 }}</ref> Such theories are known as [[Conformal field theory|conformal field theories]]. {{expand section|date=March 2017}}
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