199 research outputs found
How is chiral symmetry restored at finite density?
Taking into account pseudoscalar as well as scalar condensates, we reexamine
the chiral restoration path on the chiral manifold. We shall see both
condensates coherently produce a density wave at a certain density, which
delays chiral restoration as density or temperature is increased.Comment: 4 pages, 2 figures; proc. of QM0
Ferromagnetism and Superconductivity in Quark Matter - Color magnetic superconductivity -
A coexistent phase of spin polarization and color superconductivity in
high-density QCD is studied at zero temperature. The axial-vector self-energy
stemming from the Fock exchange term of the one-gluon-exchange interaction has
a central role to cause spin polarization. As a significant feature, the Fermi
surface is deformed by the axial-vector self-energy and then rotation symmetry
is spontaneously broken down. The gap function results in being anisotropic in
the momentum space in accordance with the deformation. It is found that spin
polarization barely conflicts with color superconductivity, and almost coexists
with it.Comment: Proc. of Int. Workshop, "Finite Density QCD", 200
Magnetic susceptibility of quark matter within Fermi-liquid theory
Possibility of spontaneous magnetization in QCD and magnetic properties of
quark matter is discussed by evaluating the magnetic susceptibility within
Fermi-liquid theory. The screening effects for gluons are taken into account to
figure out the specific properties of the magnetic transition in gauge
theories. It is shown that the static screening effect in terms of the Debye
mass does not necessarily work against the magnetic instability; it promotes
the instability, depending on the coupling constant and the number of flavors.Comment: 10 pages, 2 figure
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