Chiral density waves in the NJL_2 model with quark number and isospin chemical potentialsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We investigate the phase portrait of the (1 + 1)-dimensional massless two-flavored NJL_2 model
containing a quark number chemical potential and an isospin chemical potential in the limit of a
large number of colors N_c. Particular attention is paid to the question of to what extent the inclusion
of an isospin asymmetry affects chiral condensates to have a spatial inhomogeneity in the form of the socalled
chiral density waves (CDW) (chiral spirals). It is shown that, at zero temperature and comparatively
small values of \mu, i.e. at \mu<\mu_c = 0.68M_0 (M_0 is the dynamical quark mass in the vacuum), only the
homogeneous charged pion condensation phase is realized for arbitrary nonzero values of \mu_I . Contrary to
this, for large values of \mu>\mu_c, two CDW phases appear in the \mu_I,\mu)-phase diagram of the model. In
the first phase, CDWs are clockwise twisted chiral spirals, and in the second phase they are counterclockwise.
The influence of nonzero temperature on the formation of the CDWphases is also investigated.