Investigating Phase Transitions in Hybrid Stars Using the vMIT Bag Model and the QHD-II Model

IF 1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Astronomische Nachrichten Pub Date : 2025-01-28 DOI:10.1002/asna.20250006

Fábio Köpp, Jorge Ernesto Horvath, Dimiter Hadjimichef, César A. Zen Vasconcellos

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Abstract

In this contribution, the global properties of hybrid compact stars resulting from a phase transition between hadronic matter and an interior composed of up, down, and strange quarks, based on a Maxwell construction, are studied. For the equation of state of the hadronic matter, we employ a covariant density functional theory within the framework of relativistic mean field theory, specifically the Quantum Hadrodynamics-II (QHD-II) model, with parameters determined using the $NL 3^{*} ω ρ$ parametrization. For the quark matter in the stellar core, we use the improved vMIT bag model, which incorporates repulsive interactions mediated by vector mesons, a crucial feature for describing stable and massive hybrid stellar configurations in agreement with recent observations of pulsars with masses above $2.0 M_{⊙}$ .

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利用vMIT袋模型和QHD-II模型研究混合恒星的相变

本文基于麦克斯韦构造，研究了由强子物质和由上、下、奇夸克组成的内部相变引起的杂化致密星的全局性质。对于强子物质的状态方程，我们采用了相对论平均场理论框架内的协变密度泛函理论，特别是量子Hadrodynamics-II （QHD-II）模型。使用nl3 * ω ρ $$ NL{3}^{\ast}\omega \rho $$参数化确定参数。对于恒星核心中的夸克物质，我们使用改进的vMIT包模型，该模型包含了由矢量介子介导的排斥相互作用，这是描述稳定和大质量混合恒星结构的关键特征，与最近观测到的质量在2.0 M⊙$$ 2.0\kern0.1em {\mathrm{M}}_{\odot } $$以上的脉冲星一致。

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来源期刊

Astronomische Nachrichten 地学天文-天文与天体物理

CiteScore

1.80

自引率

11.10%

发文量

审稿时长

4-8 weeks

期刊介绍： Astronomische Nachrichten, founded in 1821 by H. C. Schumacher, is the oldest astronomical journal worldwide still being published. Famous astronomical discoveries and important papers on astronomy and astrophysics published in more than 300 volumes of the journal give an outstanding representation of the progress of astronomical research over the last 180 years. Today, Astronomical Notes/ Astronomische Nachrichten publishes articles in the field of observational and theoretical astrophysics and related topics in solar-system and solar physics. Additional, papers on astronomical instrumentation ground-based and space-based as well as papers about numerical astrophysical techniques and supercomputer modelling are covered. Papers can be completed by short video sequences in the electronic version. Astronomical Notes/ Astronomische Nachrichten also publishes special issues of meeting proceedings.