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arXiv 2603.19085nucl-thastro-ph.HE
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Nambu-Jona-Lasinio模型中的等熵混合星:中微子俘获效应

Isentropic hybrid stars in the Nambu-Jona-Lasinio model: effects of neutrino trapping

Frankfurt Institute for Advanced Studies(法兰克福高等研究院)

Andrea Sabatucci, Armen Sedrakian

AI总结:

利用Nambu-Jona-Lasinio模型和协变密度泛函描述强子-夸克相变,研究热、富含轻子的致密物质的热力学和恒星性质,发现中微子俘获显著改变粒子组成并推迟退禁闭,热中微子丰富构型具有更大半径和略高最大质量。

摘要:

双中子星并合和原中子星提供了独特环境,其中致密物质是热的、富含轻子的,并可能经历从强子物质到退禁闭夸克物质的相变。我们研究了在这种条件下混合物质的热力学和恒星性质。强子相在协变密度泛函框架内描述,而夸克相使用Nambu-Jona-Lasinio (NJL)模型建模,该模型包括排斥矢量相互作用、轴向$U_A(1)$破缺't Hooft行列式相互作用和两味色超导(2SC)配对。强子物质和夸克物质之间的相变采用混合相方案构建,该方案强制重子数和轻子数守恒,使我们能够跟踪固定熵每重子和固定轻子分数下的热力学轨迹。我们分析了有限温度下致密物质的相结构,并研究了中微子俘获和无中微子俘获情况下强子相、混合相和夸克相的组成。我们的结果表明,中微子俘获显著改变了粒子组成,并将退禁闭的起始点推迟到更高密度。利用得到的物态方程,我们计算了静态恒星构型,并研究了温度和轻子含量对混合星质量-半径关系的影响。发现热、中微子丰富的构型比其冷对应物具有更大的半径和略高的最大质量。

英文摘要:

Binary neutron star mergers and proto-neutron stars provide unique environments where dense matter is hot, lepton rich, and potentially undergoes a transition from hadronic to deconfined quark matter. We investigate the thermodynamics and stellar properties of hybrid matter under such conditions. The hadronic phase is described within a covariant density functional framework, while the quark phase is modeled using a Nambu-Jona-Lasinio (NJL) model that includes repulsive vector interactions, the axial $U_A(1)$-breaking 't Hooft determinant interaction, and two-flavor color-superconducting (2SC) pairing. The phase transition between hadronic and quark matter is constructed using a mixed-phase prescription that enforces baryon and lepton number conservation, allowing us to follow thermodynamic trajectories at fixed entropy per baryon and fixed lepton fraction. We analyze the phase structure of dense matter at finite temperature and study the composition of the hadronic, mixed, and quark phases in both neutrino-trapped and neutrino-free regimes. Our results show that neutrino trapping significantly modifies the particle composition and shifts the onset of deconfinement to higher densities. Using the resulting equations of state, we compute static stellar configurations and examine the influence of temperature and lepton content on the mass-radius relation of hybrid stars. Hot, neutrino-rich configurations are found to have larger radii and slightly higher maximum masses than their cold counterparts.

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