Study of microscopic and macroscopic QGP phenomenon

微观和宏观QGP现象的研究

• 批准号: 11440080
• 负责人: NAKAMURA Atsushi
• 金额: $ 4.93万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440080/
• 关键词: quark; hadron; quark-gluon-plasma; confinement; QCD; クォーク・グルオン・プラズマ; クォーク・グルーオン プラズマ; 高温・高密度量子色力学; 相対論的流体模型; イベントジェネレータ; 閉じこめ; 格子QCD; イベントジェネレーター; クォーク・グルーオンプラズマ

At very high temperature or density such as the very early second of the universe and neutron stars, the confinement is expected to be broken, and QGP (quark-gluon plasma) state may be realized. Now high energy nuclear collision experiments are actively done to find the QGP.At low density and high temperature we have developed a formula to calculate derivatives of hadron masses etc. with respect to the chemical potential and observed the finite signals. We also studied SU(2) QCD and found the drop of the vector meson for the first time in lattice QCD calculations.In order to understand the phase structure of gauge theories in a non-perturbative manner, we have treated the longitudinal and transverse cornponents of gauge fields carefully with Schwinger-Dyson equation, and analyzed the phase structure in details.We studied also higher dimensional effects on low energy effective electro-weak theory in Randall-Sundrum space-time. We started RHIC experiment to search for QGP. We have observed large anisotropic flow, Jet quenching, the suppression of high transverse pion production and strong rapidity correlation in locally conserved quantities.We have developed a real 3+1 dimension relativistic fluid dynamics code, and together with an event-generator of nuclear reaction which describe the early stage of the collisions, we studied the unisotropic expansion of non-central collision under the realistic initial condition.

在极高的温度或密度下，如宇宙的极初秒和中子星，这种束缚有望被打破，实现夸克-胶子等离子体（QGP）态。目前，高能核碰撞实验正在积极地寻找QGP，在低密度高温下，我们发展了计算强子质量等对化学势的导数的公式，并观测到了有限信号。我们还研究了SU（2）QCD，在格点QCD计算中第一次发现了矢量介子的下落，为了在非微扰的情况下理解规范场的相结构，我们用Schwinger-Dyson方程仔细地处理了规范场的纵向分量和横向分量，并详细分析了Randall-Sundrum时空中的相结构，研究了低能有效电弱理论中的高维效应。为了寻找QGP，我们开始了RHIC实验。我们观测到了大的各向异性流、喷流猝灭、高横介子产生的抑制和强的局域守恒快度关联.我们开发了一个真实的3+1维相对论流体动力学程序，并结合描述碰撞早期阶段的核反应事件发生器，研究了真实初始条件下非中心碰撞的各向异性膨胀.

项目成果

A.Nakamura, I.Pushkina, T.Saito, S.Sakai: "Screening of hot gluon"Physics Letters. B549. 133-138 (2002)

A.Nakamura、I.Pushkina、T.Saito、S.Sakai：“热胶子的筛选”物理快报。

K.Fukazawa, T.Inagaki, S.Mukaigawa, T.Muta: "Structure of Chiral Phase Transitions at Finite Temperature in Abelian Gauge Theories"Prog. Theor. Phys. 105. 979-998 (2001)

K.Fukazawa、T.Inagaki、S.Mukaikawa、T.Muta：“阿贝尔规范理论中有限温度下的手性相变结构”Prog。

Chiho Nonaka: "(3+1)-dimensional relativistic hydrodynamical expansion of hot and dense matter in ultra-relativistic nuclear collision"Eur.Phys.J.C. 17. 663-673 (2000)

Chiho Nonaka：“超相对论核碰撞中热致密物质的（3 1）维相对论流体动力学膨胀”Eur.Phys.J.C.

O.Miyamura, S.Choe, Y.Liu, T.Takaishi, A.Nakamura: "Responses of quark condensates to the chemical potential"Physical Review. D66. 077502 (2002)

O.Miyamura、S.Choe、Y.Liu、T.Takaishi、A.Nakamura：“夸克凝聚体对化学势的响应”物理评论。

N.Sasaki: "A calculation of the transport coefficients of hot and dense hadronic matter based on the event generator URASiMA"Nucl.Phys.. A680. 84-89 (2000)

N.Sasaki：“基于事件发生器 URASiMA 的热致密强子物质输运系数的计算”Nucl.Phys.. A680。