arXiv 2010.147282020-10-28nucl-thastro-ph.HEhep-ph

描述中子星核致密物质的非定域夸克模型

Non-local quark models for description of dense matter in the cores of neutron stars

German Malfatti

备注：: 140 pages, 29 figures, PhD Thesis
DOI：: 10.35537/10915/107749

摘要：

本论文的工作主要集中在研究核坍缩超新星、中子星的直接致密残留物中相变的可能性，以及描述致密物质内部的理论模型。具体来说，我们感兴趣的是在这些对象的核心从强子物质到夸克物质的过渡的可行性分析。对于相变，我们将使用两种不同的形式主义：麦克斯韦形式主义或突然相变和吉布斯形式主义或混合相变。对于强子物质的描述，我们将使用不同的参数化的相对论平均场模型与密度依赖的耦合常数。对于夸克物质的描述，我们将使用一个有效的非局域Nambu Jona-Lasinio模型的三种口味的矢量相互作用，其中我们将包括形成双夸克的可能性，以模拟超导相位的颜色在$SU(3)$。给出了有限温度下夸克物质的相图和状态方程，并研究了夸克物质对与中子星有关的可观测量的影响。本文研究了致密星形成过程中从原始中子星到冷中子星的简化热演化过程，并将所得结果与最近的天体物理观测结果进行了比较。所获得的结果表明，在这些恒星的核中存在夸克物质仍然是一个有希望的可能性。事实上，使用更现实的模型来描述这些物体中的致密物质表明中子星内部存在夸克物质，这可能是对这种物质行为及其相应状态方程确定问题的答案。

英文摘要：

This thesis work focuses on studying the possible existence of phase transitions in the immediate compact remnants of core collapse supernova, neutron stars, and the theoretical models that describe the interior of dense matter. Specifically, we are interested in analyzing the feasibility of a transition from hadronic matter to quark matter in the cores of these objects. For the phase transition we will use two different formalisms: the Maxwell formalism or abrupt phase transition and the Gibbs formalisms or mixed phase transition. For the description of hadronic matter, we will use different parametrizations of the relativistic mean field model with density-dependent coupling constants. For the description of quark matter we will use an effective nonlocal Nambu Jona-Lasinio model of three flavors with vector interactions, in which we will include the possibility of formation of diquarks to model a superconducting phase of color in $SU(3)$. Phase diagrams and equations of state of quark matter at finite temperature are presented, and the influence of that type of matter on observables associated with neutron stars is investigated. The simplified thermal evolution of compact stars during their formation is studied, from their state of proto-neutron stars to that of cold neutron stars, and the results obtained are compared with recent astrophysical observations. The results obtained indicate that the occurrence of quark matter in the nuclei of these stars remains a promising possibility. The fact that the use of more realistic models for the description of the dense matter in these objects indicates the presence of quark matter inside neutron stars, could be an answer to the question of the behavior of that kind of matter and the determination of its corresponding equation of state.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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