The study of the phase structure and various properties of many quarks and gluons system in the extreme conditions

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400277
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kochi University
• Principal Investigator: TSUE Yasuhiko 高知大学, 教育研究部自然科学系理学部門, 教授 (10253337)
• Research Collaborator: Joao da Providencia コインブラ大学, 理学部, 名誉教授 ; Constanca Providencia コインブラ大学, 理学部, 教授
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: クォーク・グルオン多粒子系 / QCD相構造 / 高密度クォーク物質 / 強磁場と自発磁化 / クォークスピン偏極

Outline of Final Research Achievements

Possible phases in the high density quark matter have been investigated by using the Nambu-Jona-Lasinio model with a tensor-type four-point interaction between quarks as an effective model of QCD. It has been shown that a quark-spin polarized phase appears apart from a region of the chiral condensed phase with zero and/or finite temperature and finite density. Even when there exist quark-pair correlations, it has been shown that the quark-spin polarized phase exists in a certain parameter region. Further, the mixed phase with color-superconducting gap and the quark-spin polarized condensate appears. Also, possible phases under a strong external magnetic field and a possibility of the spontaneous magnetization at high density are shown. In addition to the spin polarized phase, the ground state and excited modes on the inhomogeneous chiral condensed phase have been investigated and the dispersion relation and the correlation function of the quantum fluctuation have been clarified.

Free Research Field

理論核物理