The Octet of Goldstone-Bosons in the SU(3) Linear sigma Model in the QRPA
Abstract
A symmetry conserving, non-perturbative treatment based on a variational squeezed vacuum state in conjunction with a well-defined class of RPA fluctuations is applied to the SU(3) linear-sigma-model. It is shown that the Goldstone theorem holds exactly both at zero and finite temperature. The approach represents a systematic procedure which avoids problems of the Gaussian Functional with the symmetries.
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