Editing Chern–Simons theory (section)

===WZW and matrix models===

Chern–Simons theories are related to many other field theories. For example, if one considers a Chern–Simons theory with gauge group G on a manifold with boundary then all of the 3-dimensional propagating degrees of freedom may be gauged away, leaving a [[two-dimensional conformal field theory]] known as a G [[Wess–Zumino–Witten model]] on the boundary. In addition the ''U''(''N'') and SO(''N'') Chern–Simons theories at large ''N'' are well approximated by [[matrix theory (physics)|matrix models]].