Diquark Bose-Einstein condensation
Diquark Bose-Einstein condensation
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DOI：
10.1103/physrevd.74.034017
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发表时间：
2005-09
影响因子：
5
通讯作者：
K. Nawa;E. Nakano;H. Yabu
中科院分区：
文献类型：
--
作者：
K. Nawa;E. Nakano;H. Yabu
利用准化学平衡理论讨论了夸克物质（彩色超导体相）中复合双夸克的玻色-爱因斯坦凝聚，在接近解定义相变的相对低密度区域，其中动态夸克对波动被假设为玻色自由度（双夸克）。给出了相对论框架下双夸克形成和粒子-反粒子对形成过程的一般公式，并给出了相对论多体系统的一些有趣的特征。在模型参数空间中一般给出了夸克-二夸克物质的相变温度和相图的行为，并讨论了它们的渐近行为。作为彩色超导的一个应用，我们计算了双夸克处于束缚态/共振态的组分夸克/电流夸克的跃迁温度、夸克和双夸克密度分布。在中等密度（{rho}{下标b}{约}3{rho}{下标0}）下，我们得到组成夸克的T{下标C}{约}60-80 MeV和电流夸克的T{下标C}{约}130 MeV。该方法还在平均场近似范围内将双夸克间相互作用纳入准化学平衡理论，并发现可能存在的排斥性双夸克-双夸克相互作用使转变温度降低了{大约}50%。
Bose-Einstein condensation of composite diquarks in quark matter (the color superconductor phase) is discussed using the quasichemical equilibrium theory at a relatively low-density region near the deconfinement phase transition, where dynamical quark-pair fluctuations are assumed to be described as bosonic degrees of freedom (diquarks). A general formulation is given for the diquark formation and particle-antiparticle pair-creation processes in the relativistic framework, and some interesting properties are shown, which are characteristic for the relativistic many-body system. Behaviors of transition temperature and phase diagram of the quark-diquark matter are generally presented in model parameter space, and their asymptotic behaviors are also discussed. As an application to the color superconductivity, the transition temperatures and the quark and diquark density profiles are calculated in case with constituent/current quarks, where the diquark is in the bound/resonant state. We obtained T{sub C}{approx}60-80 MeV for constituent quarks and T{sub C}{approx}130 MeV for current quarks at a moderate density ({rho}{sub b}{approx}3{rho}{sub 0}). The method is also developed to include interdiquark interactions into the quasichemical equilibrium theory within a mean-field approximation, and it is found that a possible repulsive diquark-diquark interaction lowers the transition temperature by {approx}50%.