New phase structure of the Nambu -- Jona - Lasinio model at nonzero chemical potential
K. G. Klimenko, A. S. Vshivtsev
Abstract
It is shown that in the Nambu -- Jona - Lasinio model at nonzero chemical potential there are two different massive phases with spontaneously broken chiral symmetry. In one of them particle density is identically zero, in another phase it is not equal to zero. The transition between phases is a phase transition of the second order.
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