对称能对混合中子星状态方程的影响

IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
Parada T. P. Hutauruk, Hana Gil, Seung-il Nam, Chang Ho Hyun
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引用次数: 0

摘要

在这项研究中,我们探讨了对称能对紧凑星内强子相与夸克相之间转变的影响。我们利用能量密度函数(EDF)模型和味道 SU(2) Nambu-Jona-Lasinio (NJL)模型,采用施文格的协变正则化方案,研究了夸克-强子混合星潜在构型的性质。在这个理论框架中,我们利用从 EDF 模型得到的强子物质状态方程(EoSs)来描述强子阶段,而具有不同斥力-矢量相互作用强度的味道 SU(2) NJL 模型则代表夸克阶段。通过求解托尔曼-奥本海默-沃尔科夫方程,我们研究了不同矢量相互作用和核对称性能量下混合星构型的质量半径特性。我们的研究结果表明,发生相变的临界密度是正常核物质密度的3.6到6.7倍,这取决于对称能和矢量耦合的强度(\(G_v\))。\(G_v\) 的值影响着中子星(NS)的最大质量。在没有斥力的情况下,NS的最大质量只有太阳质量的1.5倍左右(\(M_\odot\))。不过,当矢量耦合常数大约是吸引力标量耦合常数的一半时,它还是超过了2.0(M_\odot\)。有趣的是,夸克物质并不影响NS的规范质量(1.4(M_\odot\))。因此,观测NS的规范质量可以为高密度强子物质的EoS提供有价值的约束。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of symmetry energy on the equation of state for hybrid neutron stars

Effects of symmetry energy on the equation of state for hybrid neutron stars

In this study, we explore the impact of symmetry energy on the transitions between hadron and quark phases within compact stars. We investigate the properties of potential configurations of quark-hadron hybrid stars using energy-density functional (EDF) models and the flavor SU(2) Nambu–Jona-Lasinio (NJL) model, employing Schwinger’s covariant proper-time regularization scheme. In this theoretical framework, we utilize equations of state (EoSs) of hadronic matter obtained from EDF models to describe the hadronic phase, and the flavor SU(2) NJL model with varying repulsive-vector interaction strengths represents the quark phase. By solving the Tolman–Oppenheimer–Volkoff equation, we examine the mass-radius properties of the hybrid star configurations for different vector interactions and nuclear symmetry energies. Our findings show that the critical density at which the phase transition occurs ranges from 3.6 to 6.7 times the normal nuclear-matter density, depending on the symmetry energy and the strength of the vector coupling (\(G_v\)). The value of \(G_v\) influences the maximum mass of the neutron star (NS). In the absence of a repulsive force, the maximum mass of the NS is only about 1.5 times the mass of the Sun (\(M_\odot\)). Still, it exceeds 2.0\(M_\odot\) when the vector coupling constant is approximately half of the attractive scalar coupling constant. Interestingly, quark matter does not impact the canonical mass of NS (1.4\(M_\odot\)). Therefore, observing the canonical mass of NSs can provide valuable constraints on the EoS of hadronic matter at high densities.

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来源期刊
Journal of the Korean Physical Society
Journal of the Korean Physical Society PHYSICS, MULTIDISCIPLINARY-
CiteScore
1.20
自引率
16.70%
发文量
276
审稿时长
5.5 months
期刊介绍: The Journal of the Korean Physical Society (JKPS) covers all fields of physics spanning from statistical physics and condensed matter physics to particle physics. The manuscript to be published in JKPS is required to hold the originality, significance, and recent completeness. The journal is composed of Full paper, Letters, and Brief sections. In addition, featured articles with outstanding results are selected by the Editorial board and introduced in the online version. For emphasis on aspect of international journal, several world-distinguished researchers join the Editorial board. High quality of papers may be express-published when it is recommended or requested.
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