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Chern-Simons gauge theories in 2+1 dimensions with multiple gauge fieldsexhibit novel properties that are analysed here in some detail. A strikingfeature is the possibility of a non-propagating Chern-Simons field acquiring amassless propagating mode via a Higgs mechanism. This novel Higgs mechanism,originally discovered in the context of M-theory, is studied here withoutreference to M-theory or supersymmetry. It is revealed as a variant oftopological mass generation and shown to arise only when Chern-Simons and massmatrices are not simultaneously diagonalisable. Sufficient conditions are foundfor it to occur. It is speculated that some analogue of the NHM could occur intheories of condensed-matter systems similar to those exhibiting the fractionalquantum Hall effect, as well as in 2+1 dimensional gravity.

Unravelling the novel Higgs mechanism in (2+1)d Chern-Simons theories