High density QCD and Compact stars

高密度 QCD 和致密星

基本信息

批准号：
16540246
负责人：
TATSUMI Toshitaka
金额：
$ 1.86万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

(1)Properties of the mixed phases in the first order phase transition in hadronic matter. There have been discussed various types of phase transitions, such as liquid-gas transition, kaon condensation and quark deconfinement transition, in nucloear matter as "new form of matter", and. almost all of them are of first order. Thus we must consider the first order phase transitions with multi components in hadronic matter, where the usual Maxwell construction is not accurate to get the thermodynamically well-defined equation of state (EOS). The Gibbs conditions are basic requirement for phase equilibrium. Then the structured mixed phases appears, where not only baryon number density but also charge density are nonuniform. We have studied three phase transitions mentioned above and tried to figure out the outstanding properties of the mixed phase. Based on the idea of the density functional theory we numerically determined the density profiles exactly fulfill the Gibbs conditions. In partic … More ular we have emphasized the important role of the charge screening for the Coulomb potential, which may gives rise to the mechanical instability of the geometrical structures in the mixed phase. In the extreme case the EOS given by the Maxwell construction is effectively recovered. These results affect the elementary processes inside compact stars as well as the bulk properties of compact stars.. Recently we have published a review paper concerning these works. (2)Magnetism of quark matter. We have investigated the magnetic properties of quark matter as a microscopic origin of the magnetic field observed in compact stars, based on QCD, which was stimulated by the recent discoveries of magnetars with superstrong magnetic field. As one of the important works we published a review paper in the book "Dark Matter", where we presented a basic idea about ferromagnetism in quark matter, and then discussed the coexistence of ferromagnetism with color superconductivity and production of density wave in relation to restoration of chiral symmetry. We further studied magnetism in quark matter by the use of Fermi liquid theory. We evaluated susceptibility with q-q interaction, where exchanged gluons are screened by particle-hole excitations. IR behavior of the gluon propagator is improved by the screening effect, but transverse gluons receives no static screening. We examined the screening effect on the susceptibility. We are now preparing a paper. In the ferromagnetic phase rotation symmetry is spontaneously broken, and thereby spin wave is appeared as a low energy excitation mode. We are now studying spin wave by the spiral approach. This subject is theoretically interesting, and moreover important for the temperature dependence of magnetization and specific heat. A possibility of spin density wave has been studied in relation to restoration of chiral symmetry. By considering the pseudoscalar order parameter besides the usual scalar one we presented another scenario for symmetry restoration. Less

（1）混合阶段在一阶辐射物质中的特性。已经讨论过各种类型的相变，例如液体气体过渡，kaon凝结和夸克反式转变，在核心物质中是“物质的新形式”和。它们几乎都是一级。我们必须考虑使用HADRONIC物质中具有多组分的一阶相变，即通常的Maxwell构造无法准确获得热力学定义明确的状态方程（EOS）。吉布斯条件是相平衡的基本要求。然后出现结构化的混合相，不仅重骨数密度，而且电荷密度不均匀。我们已经研究了上述三个相变，并试图找出混合阶段的出色特性。基于密度功能理论的思想，我们在数值上确定了密度曲线完全满足吉布斯条件。特别是……更多的ular，我们强调了库仑电势的电荷筛选的重要作用，这可能会导致混合阶段几何结构的机械不稳定性。在极端情况下，麦克斯韦结构提供的EO有效地回收了。这些结果会影响紧凑型恒星内的基本过程以及紧凑型星的大量特性。最近，我们发表了有关这些作品的评论论文。（2）夸克物质的磁性。我们已经根据基于QCD观察到的磁场的微观起源研究了夸克物质的磁性特性，该磁场是基于QCD的，该磁场是由于最近发现具有superstrong磁场的磁铁的发现所刺激的。作为重要的作品之一，我们在《暗物质》一书中发表了一篇评论论文，在其中，我们提出了关于夸克物质中铁磁主义的基本思想，然后讨论了铁磁主义与颜色超导性的共存，并与ry骨对称性的恢复有关。我们通过使用费米液体理论进一步研究夸克物质的磁性。我们评估了Q-Q相互作用的敏感性，在Q-Q相互作用中，通过粒子孔兴奋筛选了交换的麸质。麸质传播剂的IR行为通过筛选效果改善，但横向麸质没有接受静态筛选。我们检查了对敏感性的筛查效果。我们现在正在准备一张纸。在铁磁相相位旋转对称性中，赞助了对称性，从而将自旋波视为低能兴奋模式。我们现在正在通过螺旋方法研究自旋波。该主题是理论上有趣的，此外对于磁化和特定热的温度依赖性至关重要。已经研究了与手性对称性的恢复有关的自旋密度波的可能性。通过考虑伪命令级参数，除了通常的标量级参数，我们提出了另一种用于对称性恢复的情况。较少的

项目成果

期刊论文数量（62）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Numerical study of the hadron-quark mixed phase

DOI：
10.1016/j.nuclphysa.2004.12.063
发表时间：
2004-10
期刊：
Nuclear Physics
影响因子：
0
作者：
Tomoki Endo;T. Maruyama;S. Chiba;T. Tatsumi
通讯作者：
Tomoki Endo;T. Maruyama;S. Chiba;T. Tatsumi

Finite size effect on kaonic pasta structures

有限尺寸对 kaonic 面食结构的影响

DOI：
发表时间：
2006
期刊：
Phys.Rev.C 73
影响因子：
0
作者：
T.Tatsumi;E.Nakano;K.Nawa;T.Endo;T.Maruyama
通讯作者：
T.Maruyama

Finite size effects on kaonic pasta structures

DOI：
10.1103/physrevc.73.035802
发表时间：
2005-05
期刊：
Physical Review C
影响因子：
3.1
作者：
T. Maruyama;T. Tatsumi;D. Voskresensky;Tomonori Tanigawa;Tomoki Endo;S. Chiba
通讯作者：
T. Maruyama;T. Tatsumi;D. Voskresensky;Tomonori Tanigawa;Tomoki Endo;S. Chiba

Screening effect in quark-hadron mixed phase

夸克-强子混合相中的屏蔽效应

DOI：
发表时间：
2004
期刊：
Proc.OMEG2003
影响因子：
0
作者：
T.Maruyama;T.Tatsumi;D.N.Voskresensky;T.Tanigawa;S.Chiba;T.Maruyama;E.Nakano;Toshiki Maruyama;T.Endo;T.Tatsumi;T.Tatsumi
通讯作者：
T.Tatsumi

How is chiral symmetry restored at finite density?

如何在有限密度下恢复手性对称性？