Observational Probes of the Neutron Star Equation of State with Hyperons, Bosonic Dark Matter, and Quark Matter
University of Wrocław(弗罗茨瓦夫大学);Center for Simulations of Superdense Fluids, University of Wrocław(弗罗茨瓦夫大学超密流体模拟中心);Frankfurt Institute for Advanced Studies(法兰克福高等研究院);Alikhanyan National Science Laboratory (Yerevan Institute of Physics)(阿里哈尼扬国家科学实验室(埃里温物理研究所));Technische Universität Darmstadt(达姆施塔特工业大学);GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI亥姆霍兹重离子研究中心有限公司)
Mahboubeh Shahrbaf, Davood Rafiei Karkevandi, Alexander Ayriyan, Stefan Typel
研究通过混合模型探讨中子星中sexaquark对方程 of 状态的影响,发现其质量在1885-1935 MeV范围内可满足观测约束。
摘要:
背景。由于其对这些物体的结构和可观测性质的潜在影响,中子星中的暗物质日益引起关注。在各种候选者中,假设的sexaquark作为一种可能的玻色子暗物质粒子,可能在中子星核心的极端条件下形成。目标。我们研究了一个包含超子、玻色子暗物质(以sexaquark形式存在)和无限制的夸克物质的混合中子星模型是否能满足所有当前的观测约束。我们特别关注确定与质量半径测量和潮汐变形限制相一致的sexaquark质量范围。方法。我们使用DD2Y-T模型来处理有核相,其中包括超子,并使用非局部Nambu-Jona-Lasinio模型来处理无限制的夸克相。相变被建模为平滑的交叉过程,使用替换插值构造方法。通过有效质量移位表示排斥力引入sexaquark-重子相互作用。我们纳入了完整的当前观测数据集,包括NICER对PSRs J0437-4715的测量和新发布的J0614-3329数据,并进行了贝叶斯分析以约束sexaquark的质量。结果。我们的结果表明,sexaquark的存在使方程 of 状态变软,使混合模型能够满足围绕标准1.4 M_\odot中子星的半径和潮汐变形约束。我们发现具有大约1900 MeV sexaquark质量的混合EOS与所有可用约束一致,包括来自HESS J1731-347和PSR J0952-0607的数据,这些数据代表了迄今为止观测到的最低和最高质量的中子星。贝叶斯分析倾向于sexaquark质量范围为1885-1935 MeV,支持这种奇特粒子在中子星内部的潜在相关性。
英文摘要:
Context. The presence of dark matter in neutron stars is of growing interest due to its potential impact on the structure and observable properties of these objects. Among the various candidates, the hypothetical sexaquark has emerged as a promising bosonic dark matter particle, potentially forming under extreme conditions in neutron star cores.
Aims. We investigate whether a hybrid neutron star model that includes hyperons, bosonic dark matter (in the form of sexaquarks), and deconfined quark matter can satisfy all current observational constraints. We particularly focus on identifying the range of sexaquark masses consistent with mass-radius measurements and the tidal deformability limit.
Methods. We used the DD2Y-T model for the hadronic phase, which includes hyperons, and a nonlocal Nambu-Jona-Lasinio model for the deconfined quark phase. The phase transition was modeled as a smooth crossover using the replacement interpolation construction method. Sexaquark-baryon interactions were introduced via an effective mass shift representing repulsion. We incorporated the full set of current observational data, including NICER measurements of PSRs J0437-4715 and newly published J0614-3329 data, and performed a Bayesian analysis to constrain the sexaquark mass.
Results. Our results show that the presence of the sexaquark softens the equation of state, enabling the hybrid model to satisfy both the radius and tidal deformability constraints around the canonical 1.4 M_\odot neutron stars. We find that hybrid EOSs with a sexaquark mass around 1900 MeV are in agreement with all available constraints, including those from HESS J1731-347 and PSR J0952-0607, which represent the lowest and highest mass neutron stars observed to date. The Bayesian analysis favors a sexaquark mass range of 1885-1935 MeV, supporting the potential relevance of this exotic particle in neutron star interiors.
Hyperonic compact stars with vector portal dark matter
Utkal University(乌塔卡尔大学);University of Coimbra(科英布拉大学);Indian Institute of Science Education and Research Berhampur(印度科学教育研究学院贝尔汉普尔分校);National Institute of Science Education and Research(国家科学教育研究中心);Homi Bhabha National Institute(霍米·巴巴国立研究所);Institute of Physics Bhubaneswar(布巴内斯瓦尔物理研究所);Indian Institute of Technology Bhilai(印度理工学院比莱分校)
On the nature of the mass-gap object in the GW190814 event
在这项工作中,我们做了一个非常广泛的研究条件,允许在GW 190814事件中的质量隙对象面临的是一个退化的恒星,而不是一个黑洞。我们开始重新审视量子强子动力学(QHD)的一些参数化,然后研究在什么条件下超子存在于这样一个大质量的恒星。然后,我们利用矢量MIT模型,研究了满足Bodmer-Witten猜想的自束缚夸克星是否满足所有观测约束。最后,我们研究混合星内的麦克斯韦建设和检查什么值的袋,以及矢量相互作用,一个夸克核心的明星只有核子,并与核子混合超子可以达到至少2.50 M $_\odot$。我们的结论是,根据参数的选择,没有一种可能性可以完全排除,即,质量间隙物体可以是强子(核子或超子)、夸克或混合星。然而,有些情况比其他情况更有可能。
Thermal Effects on the Moment of Inertia and Gravitational Redshift of PSR J1012+5307: Implications for Hyperonic Matter under SU(3) and SU(6) Symmetries
Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台长春观测站);School of Astronomy and Space Sciences, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院)
Cooling of Isolated Neutron Stars with Hyperon-mixed Kaon-Condensation Matter
The University of Manchester(曼彻斯特大学);Indian Institute of Technology, Roorkee(印度理工学院鲁尔基分校);RIKEN(理化学研究所);Chiba Institute of Technology(千叶工业大学);Kurume Institute of Technology(久留米工业大学)
An EOS-Driven Extension of NSCool for Compact Star Cooling with Hadronic and Quark Degrees of Freedom
Università degli Studi della Campania “Luigi Vanvitelli”(坎帕尼亚路易吉范维特利大学);Istituto Nazionale di Fisica Nucleare, Sezione di Napoli(意大利国家核物理研究所那不勒斯分部);Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati(意大利国家核物理研究所弗拉斯卡蒂国家实验室);Universidad Rey Juan Carlos(胡安卡洛斯国王大学)
Quarkyonic matter with strangeness in an extended relativistic mean-field model
School of Physics, Zhengzhou University(郑州大学物理学院);Center for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou University(扬州大学物理科学与技术学院引力与宇宙学中心)
Towards generating a new supernova equation of state: A systematic analysis of cold hybrid stars
核心坍缩超新星(CCSNe)中的强子-夸克相变有可能在其他非爆炸模型中引发爆炸。然而,这些混合超新星状态方程(EOS)显示,触发爆炸不支持观测2 M $_\odot$中子星的最大质量约束。在这项工作中,我们分析了冷混合星的相变性质的系统参数扫描的手段,旨在开发一个新的混合超新星物态方程。强子相用最先进的超新星EOS HS(DD 2)描述,夸克物质用恒定声速(CSS)$c_{QM}^2=1/3$描述。我们发现有前途的情况下,满足2 M $_\odot$标准,是有趣的CCSN爆炸。我们表明,非常简单的CSS EOS是转移到著名的热力学袋模型,重要的CCSN模拟未来的应用。在第二部分中,讨论了细化和多次相变的发生。第四部分研究了超子对参数扫描的影响。包括超子的一般行为没有变化,除了整体较低的最大质量。在这两种情况下(有和没有超子),我们发现,夸克物质与$c_{QM}^2=1/3$可以增加最大质量,只有当约束被抑制,或者如果夸克物质是绝对稳定的。
Bayesian inference favors quark matter in neutron star interiors
University of Wroclaw(弗罗茨瓦夫大学);A. Alikhanyan National Science Lab(阿利哈尼亚扬国家科学实验室);Helmholtz-Zentrum Dresden-Rossendorf (HZDR)(德累斯顿-罗斯多夫亥姆霍兹中心);Center for Advanced Systems Understanding (CASUS)(先进系统理解中心)