Constraints on density dependent MIT bag model parameters for quark and hybrid stars

IF 1.7 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A Pub Date : 2023-11-17 DOI:10.1016/j.nuclphysa.2023.122796

Soumen Podder , Suman Pal , Debashree Sen , Gargi Chaudhuri

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引用次数: 0

Abstract

We compute the equation of state (EoS) of strange quark stars (SQSs) with the MIT Bag model using density dependent bag pressure, characterized by a Gaussian distribution function. The bag pressure's density dependence is controlled by three key parameters namely the asymptotic value ( $B_{a s}$ ), $Δ B (= B_{0} - B_{a s})$ , and β. We explore various parameter combinations ( $B_{a s}$ , ΔB, β) that adhere to the Bodmer-Witten conjecture, a criterion for the stability of SQSs. Our primary aim is to analyze the effects of these parameter variations on the structural properties of SQSs. However we find that none of the combinations can satisfy the NICER data for PSR J0030+0451 and the constraint on tidal deformability from GW170817. So it can be emphasized that this model cannot describe reasonable SQS configurations. We also extend our work to calculate structural properties of hybrid stars (HSs). With the density dependent bag model (DDBM), these astrophysical constraints are fulfilled by the HSs configurations within a very restricted range of the three parameters. The present work is the first to constrain the parameters of DDBM for both SQS and HSs using the recent astrophysical constraints on tidal deformability from GW170817 and that on mass-radius relationship from NICER data.

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夸克星与杂化星密度相关的MIT袋模型参数约束

利用密度相关的袋压，采用高斯分布函数，利用MIT Bag模型计算奇异夸克星的状态方程。袋子压力的密度依赖性由三个关键参数控制，即渐近值(Bas)、ΔB(=B0−Bas)和β。我们探索了各种参数组合(Bas， ΔB， β)，它们符合Bodmer-Witten猜想，这是SQSs稳定性的标准。我们的主要目的是分析这些参数变化对SQSs结构特性的影响。然而，我们发现这些组合都不能满足PSR J0030+0451的NICER数据和GW170817的潮汐变形性约束。因此需要强调的是，该模型不能描述合理的SQS配置。我们还将我们的工作扩展到计算混合星(HSs)的结构特性。在密度依赖袋模型(DDBM)中，这些天体物理约束在三个参数的非常有限的范围内由HSs的配置来满足。本文首次利用GW170817潮汐可变形性的天体物理约束和NICER数据质量-半径关系的天体物理约束，对SQS和HSs的DDBM参数进行了约束。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Physics A 物理-物理：核物理

CiteScore

3.60

自引率

7.10%

发文量

113

审稿时长

61 days

期刊介绍： Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.