Key points are not available for this paper at this time.
Some proofs are presented of Goldstone's conjecture, that if there is continuous symmetry transformation under which the Lagrangian is invariant, then either the vacuum state is also invariant under the transformation, or there must exist spinless particles of zero mass.
Goldstone et al. (1962) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: