Relativistic star with Bose–Einstein condensate core and polytropic envelope in Karmarkar regime

IF 1.6 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Amos V. Mathias, Jefta M. Sunzu, Jason M. Mkenyeleye
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引用次数: 0

Abstract

A new anisotropic star model with core-envelope division is generated. The star is assumed to have the core composed of Bose–Einstein Condensate matter and polytropic envelope. The interior space-time is considered to be static and spherically symmetric in relativistic framework. We specify one of the gravitational potentials \(e^{\lambda }\) and \(e^{\nu }\) and then apply the Karmarkar condition to generate our model. The model formulated is free from central singularities and is verified by various stability tests and energy conditions. The equilibrium of the present model is examined by analysing TOV-equation. Stellar masses and radii of compact fluid spheres consistent with observations including Vela X-1, PSRJ1903+327, Cen X-3 and Her X-1 have been generated by using this model. The profiles for the matter variables in the present model are well behaved. It is entrancing to note that a multi-layered star model with core admitting Bose–Einstein condensate equation of state in embedding setting is missing in the previous studies.

Abstract Image

具有玻色-爱因斯坦凝聚态内核和多向性包层的卡玛卡尔机制相对论星体
生成了一个新的各向异性恒星模型,该模型具有内核-包络分裂。假设恒星的内核由玻色-爱因斯坦凝聚态物质和多向性包膜组成。在相对论框架下,内部时空被认为是静态和球对称的。我们指定了引力势 \(e^{\lambda }\) 和 \(e^{\nu }\) 中的一个,然后应用卡尔马卡条件生成我们的模型。所建立的模型不存在中心奇点,并通过各种稳定性测试和能量条件得到了验证。通过分析 TOV-方程,检验了本模型的平衡性。利用该模型生成了与观测结果一致的紧凑流体球的恒星质量和半径,包括 Vela X-1、PSRJ1903+327、Cen X-3 和 Her X-1。本模型中物质变量的曲线表现良好。值得注意的是,在以往的研究中还没有发现在嵌入环境中具有核心的多层恒星模型,其核心可以接受玻色-爱因斯坦凝聚态方程。
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来源期刊
Indian Journal of Physics
Indian Journal of Physics 物理-物理:综合
CiteScore
3.40
自引率
10.00%
发文量
275
审稿时长
3-8 weeks
期刊介绍: Indian Journal of Physics is a monthly research journal in English published by the Indian Association for the Cultivation of Sciences in collaboration with the Indian Physical Society. The journal publishes refereed papers covering current research in Physics in the following category: Astrophysics, Atmospheric and Space physics; Atomic & Molecular Physics; Biophysics; Condensed Matter & Materials Physics; General & Interdisciplinary Physics; Nonlinear dynamics & Complex Systems; Nuclear Physics; Optics and Spectroscopy; Particle Physics; Plasma Physics; Relativity & Cosmology; Statistical Physics.
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