A comprehensive analysis of anisotropic stellar objects with quadratic equation of state

IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pramana Pub Date : 2024-11-09 DOI:10.1007/s12043-024-02846-8
Kiran Pant, Pratibha Fuloria
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Abstract

The present investigation examines the behaviour of compact relativistic objects characterised by static and spherically symmetric space–time for neutral anisotropic matter distribution. More specifically, we consider an equation of state (EoS), in which density and radial pressure are connected with each other quadratically. By smoothly matching the interior space–time with the exterior at the stellar surface, the appropriate values of the constant parameters for physically realistic solutions are obtained to model various compact stars. We explore the physical behaviour of compact stellar models SMC X-4, Vela X-1, CEN X-3, PSR J1614-2230, LMC X-4 and EXO 1785-248. Further, we describe several features of the compact stellar systems that exhibit physically acceptable attributes with no singularity. All important stability criteria, such as the energy conditions, causality conditions, Buchdhal condition and the adiabatic index are fulfilled by our neutral anisotropic compact star models. An in-depth comprehension of the physical characteristics of the proposed solution has been achieved through meticulous analytical and graphical examinations. By utilising this solution, the masses and radii of six compact stellar candidates mentioned above are optimised with the observed values obtained experimentally. The derived solution might be useful to enhance the understanding of the strong-field regimes and self-gravitating entities.

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具有二次状态方程的各向异性恒星物体的综合分析
本研究探讨了中性各向异性物质分布的静态球对称时空下紧凑相对论物体的行为。更具体地说,我们考虑了一个状态方程(EoS),其中密度和径向压力相互之间是二次连接的。通过将内部时空与恒星表面的外部时空平滑匹配,我们获得了物理现实解的适当常量参数值,从而为各种紧凑型恒星建模。我们探讨了紧凑型恒星模型 SMC X-4、Vela X-1、CEN X-3、PSR J1614-2230、LMC X-4 和 EXO 1785-248 的物理行为。此外,我们还描述了紧凑型恒星系统的几个特点,它们表现出物理上可接受的属性,没有奇点。我们的中性各向异性紧凑恒星模型满足所有重要的稳定性标准,如能量条件、因果关系条件、布赫达尔条件和绝热指数。通过细致的分析和图形检验,我们深入理解了所提出解决方案的物理特性。利用这一方案,上述六颗紧凑型候选恒星的质量和半径与实验观测值进行了优化。推导出的解决方案可能有助于加深对强场机制和自引力实体的理解。
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来源期刊
Pramana
Pramana 物理-物理:综合
CiteScore
3.60
自引率
7.10%
发文量
206
审稿时长
3 months
期刊介绍: Pramana - Journal of Physics is a monthly research journal in English published by the Indian Academy of Sciences in collaboration with Indian National Science Academy and Indian Physics Association. The journal publishes refereed papers covering current research in Physics, both original contributions - research papers, brief reports or rapid communications - and invited reviews. Pramana also publishes special issues devoted to advances in specific areas of Physics and proceedings of select high quality conferences.
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