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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)强子物质一级相变混合相的性质。人们已经讨论了核物质中作为“物质新形式”的各种类型的相变，例如液-气相变、卡子凝聚和夸克解禁闭相变。几乎所有这些都是一等的。因此，我们必须考虑强子物质中具有多组分的一阶相变，其中通常的麦克斯韦构造无法准确地获得热力学明确定义的状态方程（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，其中不仅重子数密度而且电荷密度都是不均匀的。我们研究了上述三种相变，并试图找出混合相的突出性能。基于密度泛函理论的思想，我们数值确定了完全满足吉布斯条件的密度分布。特别是，我们强调了电荷屏蔽对库仑势的重要作用，这可能会导致混合相中几何结构的机械不稳定性。在极端情况下，麦克斯韦结构给出的 EOS 被有效恢复。这些结果影响致密星内部的基本过程以及致密星的整体特性。最近我们发表了一篇关于这些工作的评论论文。 (2)夸克物质的磁性。我们基于 QCD 研究了夸克物质的磁性，作为致密星中观察到的磁场的微观起源，这是受到最近发现的具有超强磁场的磁星的刺激。作为重要工作之一，我们在《暗物质》一书中发表了一篇综述论文，提出了夸克物质中铁磁性的基本思想，然后讨论了铁磁性与彩色超导性的共存以及与手性对称性恢复相关的密度波的产生。我们利用费米液体理论进一步研究了夸克物质的磁性。我们通过 q-q 相互作用评估了敏感性，其中交换的胶子通过粒子空穴激发进行筛选。屏蔽效应改善了胶子传播器的红外行为，但横向胶子没有受到静态屏蔽。我们检查了筛查对敏感性的影响。我们现在正在准备一篇论文。在铁磁相中，旋转对称性自发破缺，从而出现自旋波作为低能激发模式。我们现在正在通过螺旋方法研究自旋波。这个课题在理论上很有趣，而且对于磁化强度和比热的温度依赖性也很重要。已经研究了与手性对称性恢复相关的自旋密度波的可能性。通过考虑除通常标量之外的伪标量阶参数，我们提出了另一种对称性恢复场景。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）

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

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 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

Pasta structures in compact stars

致密星中的面食结构