Coulomb gauge, the full Higgs phenomenon is explained by the failure of relative
locality between the current and the Higgs field, by exactly the same mechanism
discussed in Chap. 25 for the non-relativistic Coulomb systems; in particular, the
Goldstone spectrum is shown to be given by the Fourier spectrum of the two point
function of the vector boson field, which cannot have a dðk
2
Þ contribution, since
otherwise the symmetry would not be broken.
The chapters marked with a * can be skipped in a first reading.
The second edition differs from the first by the correction of some misprints, by
an improved discussion of some relevant points and by a significantly expanded and
more detailed discussion of symmetry breaking in gauge theories.
Preface to Previous Edition
ix