This process cannot occur in systems with short-range interactions in dimensions smaller than or equal to 2, a result knownas the Mermin-Wagner theorem. Nambu and Jona-Lasiniu demonstrated that the fermion mass resulting from this phenomenonwith respect to chirality was analogous to the mass gap that results from this phenomenon in the BCS theory ofsuperconductors. In Landau-Ginzburg theory, this 
This process cannot occur in systems with short-range interactions in dimensions smaller than or equal to 2, a result knownas the Mermin-Wagner theorem. Nambu and Jona-Lasiniu demonstrated that the fermion mass resulting from this phenomenonwith respect to chirality was analogous to the mass gap that results from this phenomenon in the BCS theory ofsuperconductors. In Landau-Ginzburg theory, this phenomenon accompanies phase transitions and occurs when the orderparameter changes discontinuously. The occurrence of this phenomenon under conditions of global continuity is always accompaniedby the appearance of massless spin-zero particles as a consequence of Goldstone's theorem. The Higgs mechanismdescribes how the W and Z bosons acquire mass as a result of this phenomenon, which disappears at high temperatures, suchas when a ferromagnet raised above the Curie temperature become paramagnetic. For 10 points, identify this phenomenon inwhich a physical system loses its invariance under certain operations.
This process cannot occur in systems with short-range interactions in dimensions smaller than or equal to 2, a result knownas the Mermin-Wagner theorem.
 spontaneous symmetry breaking