具有各向异性的芬奇-斯基亚暗能量星

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astrophysics and Space Science Pub Date : 2024-07-30 DOI:10.1007/s10509-024-04341-3
Bibhash Das, Somi Aktar, Farook Rahaman, Bikash Chandra Paul
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引用次数: 0

摘要

我们在广义相对论框架内提出了一个各向异性紧凑天体的相对论模型,该模型具有球对称物质分布,并与暗能量相耦合。除了重子物质之外,我们还假定了暗能量(DE)状态方程(EoS)的解析。紧凑天体的内部时空由芬奇-斯基亚(Finch-Skea,FS)度量和具有耦合参数(\beta \)的暗能量因果域描述。我们在相对论恒星模型中测试了恒星模型在不同的 \(\beta \) 值下的稳定性。恒星内部物质构型的EoS是在不同的(\beta \)非线性条件下确定的。通过改变DE耦合参数(\(\beta \))得到的EoS表明,当\(\beta \)较小时,DE恒星内部的物质更坚硬。获得现实恒星模型的方法被用于其他脉冲星。这些脉冲星的状态方程和模型参数是根据它们的观测质量和半径确定的。质量-半径(M-R)关系与耦合参数\(\beta \)无关,并且M-R关系与观测约束相一致。
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Finch-Skea dark energy star with anisotropy

We present a relativistic model of anisotropic compact objects with spherically symmetric matter distribution coupled with dark energy in the framework of general theory of relativity. We assumed an ansatz for the dark energy (DE) equation of state (EoS) in addition to the baryonic matter. The interior spacetime of the compact object is described by the Finch-Skea (FS) metric and a causal domain of DE with a coupling parameter \(\beta \). The stellar model is employed to investigate physical features such as energy density, radial pressure, transverse pressure, anisotropy, mass-radius relation, EoS, etc. for a known pulsar, PSR J0348+0432 (\(M = 2.01 \pm 0.04 M_{\odot }\) and \(R = 12.072\) km) taking different \(\beta \). We test the stability of the stellar models for various values of \(\beta \) in a relativistic stellar model. The EoS of the matter configuration inside the star is determined for different \(\beta \) which are non-linear. The EoS obtained varying the DE coupling parameter (\(\beta \)) indicates that the matter inside the DE star is more stiff for less \(\beta \). The prescription for obtaining a realistic stellar model is used to employ for other pulsars. The equation of states for those pulsars and the model parameters are determined for their observed masses and radii. The Mass-Radius (M-R) relation is independent of the coupling parameter \(\beta \) and the M-R relation is consistent with the observational constraints.

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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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