Theoretical studies of extreme states of matter

2016 Fiscal Year Final Research Report

• Project/Area Number: 25400247
• 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: The Open University of Japan (2015-2016); The University of Tokyo (2013-2014)
• Principal Investigator: Matsui Tetsuo 放送大学, 教養学部, 教授 (00252528)
• Research Collaborator: Watanabe Kazuhiro 東京大学, 大学院総合文化研究科 ; Yamazaki Kanako 東京大学, 大学院理学系研究科 ; Taya Hidetoshi 東京大学, 大学院理学系研究科
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 高温ハドロン/クォーク物質 / クォーク閉じ込めの有効理論 / 高エネルギー重イオン衝突 / クォーク・グルーオンプラズマ

Outline of Final Research Achievements

Transition from low temperature hadron phase to high temperature quark phase was studied theoretically in terms of an effective theory (PNJL model) incorporating chiral symmetry and quark confinement. In the baryon free regime as realized in high energy nuclear collisions, the low temperature phase is filled with thermal bosonic excitations of low mass pions and kaons, which turns into the high temperature phase filled with quark and anti-quark excitations in gluon thermal excitations. In this description, pions and kaons are described as collective excitations consisting of quark and antiquark. We studied how the degrees of thermal excitations change by varying temperature from boson-type to fermion-type excitations focusing on the entropy contents of the system.

Free Research Field

理論核物理