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  • $\begingroup$ I think you may be getting mixed up between “Higgs mode” and “Higgs mechanism”. No one would call anything not involving a local gauge symmetry a “Higgs mechanism”, but maybe people do call the amplitude fluctuations in the order parameter a “Higgs mode” more generally, though this usage is a bit misleading because it erroneously suggests a connection with a “Higgs mechanism”, which is basically the point Pekker and Varma are making. $\endgroup$
    – Dominic Else
    Commented Jun 17, 2019 at 17:30