Phase diagram of dynamical twisted-mass Wilson fermions at finite isospin chemical potential
Janssen, Oliver
Kieburg, Mario
Splittorff, K.
Verbaarschot, Jacobus J. M.
Zafeiropoulos, Savvas
We consider the phase diagram of twisted-mass Wilson fermions of two-flavor QCD in the parameter space of the quark mass, the isospin chemical potential, the twist angle and the lattice spacing. This work extends earlier studies in the continuum and those at zero chemical potential. We evaluate the phase diagram as well as the spectrum of the (pseudo-)Goldstone bosons using the chiral Lagrangian for twisted-mass Wilson fermions at nonzero isospin chemical potential. The phases are obtained from a mean field analysis. At zero twist angle we find that already an infinitesimal isospin chemical potential destroys the Aoki phase. The reason is that in this phase we have massless Goldstone bosons with a nonzero isospin charge. At finite twist angle, only two different phases are present-one phase which is continuously connected to the Bose condensed phase at nonzero chemical potential, and another phase which is continuously connected to the normal phase. For either zero or maximal twist, the phase diagram is more complicated, as the saddle-point equations allow for more solutions.
Amer Physical Soc
2016
info:eu-repo/semantics/article
doc-type:article
text
https://pub.uni-bielefeld.de/record/2904082
Janssen O, Kieburg M, Splittorff K, Verbaarschot JJM, Zafeiropoulos S. Phase diagram of dynamical twisted-mass Wilson fermions at finite isospin chemical potential. <em>Physical Review D</em>. 2016;93(9): 094502.
eng
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevD.93.094502
info:eu-repo/semantics/altIdentifier/issn/2470-0010
info:eu-repo/semantics/altIdentifier/issn/2470-0029
info:eu-repo/semantics/altIdentifier/wos/000375655000009
info:eu-repo/semantics/altIdentifier/arxiv/1509.02760
info:eu-repo/semantics/closedAccess