杜尔加帕尔IV元公设中的新一类各向异性带电奇异夸克星及其最大质量

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
S. Sarkar, D. Bhattacharjee, K. B. Goswami, P. K. Chattopadhyay
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引用次数: 0

摘要

摘要 本文探讨了考虑压力各向异性的相对论恒星模型。本文提出了带电奇异夸克星的爱因斯坦场方程(Einstein Field Equations,以下简称EFE)的各向异性解,并考虑了由Durgapal \(IV^{th}\)度量描述的内部时空几何。在奇异夸克星的情况下,如果MIT袋模型中规定的状态方程\(p_{r}=\frac{1}{3}(\rho -4B_{g})\)适用,那么在表面,我们可以认为表面能量密度\(\rho _{s}=4B_{g}\)。将外部压力为零时相对于中子的稳定夸克物质所需的\(B_{g}\)的约束值施加在57.55 - \(95.11~MeV/fm^{3}\)的范围内,我们就确定了奇异夸克星的最大质量和半径以及其他相关性质。我们注意到,当 \(B_{g}=57.55~MeV/fm^{3}\) 的最大质量和半径分别为 \(M_{max}=2.92M_\{odot }\) 和 \(b_{max}=13.749~km\) ,而对于各向同性的不带电恒星来说,\(B_{g}=95.11~MeV/fm^{3}\) 和\(b_{max}=10.695~km\)分别是(M_{max}=2.27M_{odot }\) 和\(b_{max}=10.695~km\)。在存在压力各向异性和电荷的情况下,最大质量值会增加。我们根据模型预测了几颗最近观测到的脉冲星的半径,发现其半径与观测预测一致。此外,本模型还满足稳定性和能量条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New class of anisotropic charged strange quark star in Durgapal \(IV\) metric and its maximum mass

In this paper, we have explored the relativistic stellar model considering pressure anisotropy. An anisotropic solution of the Einstein Field Equations (henceforth EFE) has been presented for charged strange quark stars considering the interior space-time geometry described by the Durgapal \(IV^{th}\) metric. In the case of a strange quark star, if the equation of state \(p_{r}=\frac{1}{3}(\rho -4B_{g})\) as prescribed in the MIT bag model is applicable, then at the surface, one may consider that the surface energy density \(\rho _{s}=4B_{g}\). Imposing the constraint value of \(B_{g}\) within the range of 57.55 - \(95.11~MeV/fm^{3}\) required for stable quark matter with respect to a neutron when the external pressure is zero, we have determined the maximum mass and radius of the strange quark star and other relevant properties. It is noted that the maximum mass and radius for \(B_{g}=57.55~MeV/fm^{3}\) are \(M_{max}=2.92M_{\odot }\) and \(b_{max}=13.749~km\), respectively, whereas those for \(B_{g}=95.11~MeV/fm^{3}\), are \(M_{max}=2.27M_{\odot }\) and \(b_{max}=10.695~km\) for an isotropic uncharged star. In the presence of pressure anisotropy and charge, the value of maximum mass increases. We have predicted the radii of a few recently observed pulsars from our model and found that the radii agree with the predictions from observations. Furthermore, stability and energy conditions are also satisfied in the present model.

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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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