Besides Higgs Field, and not counting purely theoretical universal scalar fields such as those attributed to branes, how many universal scalar fields have been demonstrated? Please include names of such fields, if they exist.

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    If you only count possibly fundamental fields, it is just the Higgs. That's a big part of why it's so important -- it's the first scalar field we've found. – knzhou Nov 8 at 18:48
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    Nothing beyond the Standard Model has been experimentally observed, and the Higgs is the only scalar in the standard model. So, for now it's just the Higgs. – John Rennie Nov 8 at 18:54
  • What is a "universal" field? If you ask for scalar fields: pions are excitations of scalar fields. – Lorenz Mayer Nov 8 at 20:55
  • @LorentzMayer to nitpick just a bit, pions are pseudoscalars, not scalars, but, of course, there are scads of scalar mesons as well; either will obey the K-G equation that seems to intrigue the OP, albeit without clear justification. Elementary vs composite distinctions may well be an arrogant affectation of somebody's confidence that Higgs substructure would not be observable in their lifetime... – Cosmas Zachos Nov 9 at 1:24

There's just the Higgs field.

The Klein-Gordon equation is a classical scalar field that's used to teach quantisation of classical fields but there is no such physical field. In fact, Schrodinger found this equation before his eponymous equation but discarded it because of its unphysical properties.

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    Isn't the Higgs field described by the Klein-Gordon equation? – doetoe Nov 8 at 22:36

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