Dynamics of the quark-gluon plasma and high density hadronic matter

夸克-胶子等离子体和高密度强子物质的动力学

基本信息

批准号：
14540255
负责人：
ASAKAWA Masayuki
金额：
$ 1.73万
依托单位：
Osaka University (2004)Kyoto University (2002-2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540255/
关键词：
lattice gauge theory spectral function high energy heavy ion collision universality phase transition fluctuation equation of state finite temperature field theory 超相対論的重イオン衝突非平衡場の理論カイラル対称性超相対論点重イオン衝突

项目摘要

1 We have constructed the spectral functions at finite temperature for the vector (J/ψ) and axial-vector (η_c) channels made of a charm and anti-charm quark pair from their correlation functions measured on the Euclidean lattices with the maximum entropy method, which was applied systematically to lattice gauge theory for the first time by our group. It was shown that both states continue to exist up to a temperature that is much higher than the QCD phase transition temperature, that is, about 1.6T_c and that they both disappears in a very narrow temperature region, between about 1.6T_c and 1.7T_c This suggests that the quark-gluon plasma is not a state where quarks and gluons are almost freely moving as usually believed, but that it is a strongly coupled system where also hadronic excitations coexists.2 It has been argued that there is possibly a critical end point on the QCD phase diagram, where the order of the phase transition changes from first to crossover We have derived general equations of states with a critical end point on the basis of the universality hypothesis in phase transition theory and found that it acts as an attractor in the course of the time evolution of the system. Furthermore, we discussed for the first time the time evolution of fluctuations and correlation lengths when the system created in high energy heavy ion collisions pass the proximity of the critical end point in the course of its time evolution and their effects on observables in a unified framework.

1我们已经在有限温度下的光谱函数（J/ψ）和轴向矢量（η_c）通道构建了由魅力和反charm夸克对制成的，它们是由它们的相关函数与欧几里得质格的相关函数与我们的最大熵方法测量的相关函数，该方法与我们的最大熵方法一起使用，该方法是系统地应用于我们的第一个时段的第一次。结果表明，这两种状态都继续存在至比QCD相过渡温度高得多的温度，即约1.6T_C，它们都在非常狭窄的温度区域消失，大约1.6T_C和1.7T_C之间，这表明Quark-gluon Plasma几乎不是一个夸张的状态和gluons and Quarks和Gluons and Systron，但它是一个强烈的系统。 2有人认为，QCD相图上可能存在关键的终点，其中相变的顺序从第一次转换为跨界，我们得出了基于相变理论中宇宙假设的临界点的状态的通用方程，并发现它在系统的时间进化过程中起着吸引者的吸引者。此外，当在高能量重离子碰撞中创建的系统在其时间演变过程中，临界终点的接近度及其对统一框架中的观测值的影响。