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Article overview
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Roles of axial anomaly on neutral quark matter with color superconducting phase | | Zhao Zhang
; Teiji Kunihiro
; | | Date: |
16 Feb 2011 | | Abstract: | We investigate effects of the axial anomaly term with a chiral-diquark
coupling on the phase diagram within a two-plus-one-flavor Nambu-Jona-Lasinio
(NJL) model under the charge-neutrality and $eta$-equilibrium constraints. We
find that when such constraints are imposed, the new anomaly term plays a quite
similar role as the vector interaction does on the phase diagram, which the
present authors clarified in a previous work. Thus, there appear several types
of phase structures with multiple critical points at low temperature $T$,
although such phase diagrams with low-$T$ critical point(s) are never realized
without these constraints even within the same model Lagrangian. This drastic
change is attributed to an enhanced interplay between the chiral and diquark
condensates due to the anomaly term at finite temperature; the u-d diquark
coupling is strengthened by the relatively large chiral condensate of the
strange quark through the anomaly term, which in turn definitely leads to the
abnormal behavior of the diquark condensate at finite $T$, inherent to the
asymmetric quark matter. We also show that the chromomagnetic instability of
the neutral asymmetric homogenous two-flavor color superconducting(2CSC) phase
is suppressed and can be even completely cured by the enhanced diquark coupling
due to the anomaly term and/or by the vector interaction. | | Source: | arXiv, 1102.3263 | | Services: | Forum | Review | PDF | Favorites | |
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