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Study of microscopic and macroscopic QGP phenomenon

微观和宏观QGP现象的研究

基本信息

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

项目摘要

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.

在非常高的温度或密度下，如宇宙和中子星的极初秒，束缚有望被打破，QGP（夸克-胶子等离子体）态有望实现。目前，人们正在积极进行高能核碰撞实验来寻找QGP。在低密度和高温下，我们开发了一个公式来计算强子质量等对化学势的导数，并观察了有限信号。我们还研究了SU(2) QCD，并首次在晶格QCD计算中发现了矢量介子的下降。为了以非微扰的方式理解规范理论的相结构，我们用Schwinger-Dyson方程对规范场的纵向和横向分量进行了仔细的处理，并对其相结构进行了详细的分析。我们还研究了Randall-Sundrum时空中低能有效电弱理论的高维效应。我们启动了RHIC实验来寻找QGP。我们观察到大的各向异性流动，射流淬火，抑制高横介子产生和强的局部守恒量的快速相关。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同性扩展。