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Ok. I'm trying to get the terminology right about the term ghost in physics. Is there any equivalence between these terms?

  • Faddeev-Popov ghosts

  • Paul-Villars ghosts

  • Landau ghost

  • The vanishing Goldstone bosons in electroweak symmetry breaking

Does any of these terms encapsulates one of the others?

Does the term antighost apply to any of these?

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    $\begingroup$ There's no such term in physics. There are individual terms, which you nicely enumerated ;) $\endgroup$ Commented Apr 25, 2018 at 16:30

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All they have in common is being unphysical. Faddeev-Popov ghosts can't be observed as particles because they violate the spin-statistics tension; Pauli-Villars ghosts are negative-norm states; the Landau pole tells you your theory must give way to another at high energies; Goldstone ghosts represent an unphysical artefact of gauge fixing.

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