Speaker
Ryo Yoshiike
(Kyoto university)
Description
We study the magnetic properties of the inhomogeneous chiral phase, considering the “dual chiral density wave (DCDW)”, where both scalar and pseudoscalar condensates are spatially modulated. The response of quark matter to a tiny external magnetic field is investigated to show the spontaneous magnetization in the DCDW phase. In an external magnetic field, the energy spectrum of quarks becomes asymmetric about zero in the lowest Landau level, and it is clearly related to chiral anomaly.
We find that this spectral asymmetry also gives rise to the spontaneous magnetization, since a new term linearly proportional to the magnetic field is induced in the thermodynamic potential. Furthermore, this spontaneous magnetization includes not only the contribution of chiral anomaly but also one of valence quarks. Such spontaneous magnetization might be a candidate for the origin of the strong magnetic field in neutron stars.
We also show the peculiar behavior of magnetic susceptibility at the ferromagnetic transition point: it never diverges unlike the usual ferromagnetic transition, which suggests there is no spontaneous symmetry breaking as in the spin alignment.
Primary author
Ryo Yoshiike
(Kyoto university)
Co-authors
Kazuya Nishiyama
(Kyoto university)
Toshitaka Tatsumi
(Kyoto U.)
