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Symmetry breaking patterns of the U(n)_L x U(n)_R symmetric meson model areinvestigated in a formulation involving three auxiliary composite fields. Theeffective potential is constructed at leading order in the 1/n expansion for acondensate belonging to the center of the U(n) group. A wide region is found inthe coupling space where in addition to the condensate proportional to the unitmatrix, also metastable minima exist, in which a further breakdown of thediagonal U_V(n) symmetry to U_V(n-1) is realized. Application of a moderateexternal field conjugate to this component of the order parameter changes thisstate into the true ground state of the system.

Spontaneously broken ground states of the U(n)_L x U(n)_R linear sigma model at large n