Anisotropic stellar modeling via MIT Bag model EoS admitting Finch–Skea spacetime in f(Q) gravity

IF 2.8 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY The European Physical Journal Plus Pub Date : 2024-11-16 DOI:10.1140/epjp/s13360-024-05778-9

Allah Ditta, Munaza Asia, Abdelghani Errehymy, G. Mustafa, S. K. Maurya, Asif Mahmood

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Abstract

This study evaluates the viability and stability of anisotropic compact stellar objects by utilizing the Finch–Skea spacetime solutions in f(Q) gravity, where Q is a nonmetricity scalar that incorporates gravitational effects. The physical properties of the compact star EXO 1785-248 are investigated by employing a static spherical metric in the inner region and Schwarzschild spacetime in the outer region. The unknown parameters are determined using observed values of the radius and mass of the studied compact star. The suggested mass and radius values of EXO 1785-248 from existing literature are utilized. Subsequently, calculations are conducted to determine the essential features of the compact star and establish its stability and physical existence. Various aspects are analyzed, including energy density, pressure profiles, gradients, anisotropic factors, energy conditions, sound speeds, Tolman–Oppenheimer–Volkoff forces, equation of state components, mass function, compactification, and redshift, in order to achieve this objective.

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通过 MIT Bag 模型 EoS 在 f(Q) 引力下接纳芬奇-斯基亚时空的各向异性恒星建模

本研究通过利用 f(Q) 引力下的芬奇-斯基亚时空解（其中 Q 是包含引力效应的非度量标量），评估了各向异性紧凑型恒星天体的可行性和稳定性。通过在内部区域采用静态球面度量和在外部区域采用施瓦兹柴尔德时空，研究了紧凑型恒星 EXO 1785-248 的物理特性。未知参数是根据所研究的紧凑型恒星的半径和质量观测值确定的。利用现有文献中建议的 EXO 1785-248 的质量和半径值。随后，通过计算确定了这颗紧凑型恒星的基本特征，并确定了其稳定性和物理存在性。为了实现这一目标，对各方面进行了分析，包括能量密度、压力曲线、梯度、各向异性因子、能量条件、声速、托尔曼-奥本海默-沃尔科夫力、状态方程成分、质量函数、致密化和红移。

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来源期刊

The European Physical Journal Plus PHYSICS, MULTIDISCIPLINARY-

CiteScore

5.40

自引率

8.80%

发文量

1150

审稿时长

4-8 weeks

期刊介绍： The aims of this peer-reviewed online journal are to distribute and archive all relevant material required to document, assess, validate and reconstruct in detail the body of knowledge in the physical and related sciences. The scope of EPJ Plus encompasses a broad landscape of fields and disciplines in the physical and related sciences - such as covered by the topical EPJ journals and with the explicit addition of geophysics, astrophysics, general relativity and cosmology, mathematical and quantum physics, classical and fluid mechanics, accelerator and medical physics, as well as physics techniques applied to any other topics, including energy, environment and cultural heritage.