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arXiv 2307.08005gr-qc
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自相互作用Brans-Dicke引力范畴下的退耦夸克星相对论模型

Decoupled Quark Stars Relativistic Models in the Regime of Self-interacting Brans-Dicke Gravity

M. Sharif, Amal Majid

AI总结:

本研究在自相互作用Brans-Dicke引力理论下,通过径向度规形变退耦场方程,结合MIT袋模型等构造两种夸克星静态各向异性解,验证了其针对三颗奇异星候选体的可行性与稳定性。

摘要:

在本研究中,我们在自相互作用Brans-Dicke理论框架下,为包含夸克物质的球体构造了两种静态各向异性解。为此,我们在种子分布中加入各向异性源,并通过径向度规函数的形变对场方程进行退耦。该变换将场方程分解为两个系统,分别包含各向同性源与各向异性源的效应。对应附加源的系统通过MIT袋模型物态方程求解。我们采用Tolman V时空和Karmarkar条件,为各向同性部分构造了两种解,并通过退耦技术将其拓展至各向异性区域。边界处的连接条件以球形天体的质量和半径为变量确定了未知参数。我们针对三颗奇异星候选体——Her X-1、PSR J1614-2230和4U 1608-52,研究了存在有质量标量场时所构建奇异星模型的可行性与稳定性。研究结论表明,这些各向异性模型表现良好,在退耦参数取低值和高值时均能满足必要条件。

英文摘要:

In this work, we generate two static anisotropic solutions for a sphere containing quark matter in the framework of self-interacting Brans-Dicke theory. For this purpose, we add an anisotropic source in the seed distribution and decouple the field equations through deformation in the radial metric function. As a result of this transformation, the field equations are disintegrated into two systems which separately include the effects of isotropic and anisotropic sources. The system related to the additional source is solved via the MIT bag model equation of state. We consider Tolman V spacetime and Karmarkar condition to formulate two solutions for the isotropic sector which are extended to the anisotropic domain via decoupling technique. The junction conditions at the boundary determine the unknown parameters in terms of mass and radius of the spherical object. We investigate the viability and stability of the constructed strange star models in the presence of massive scalar field corresponding to three strange star candidates: Her X-1, PSR J1614-2230 and 4U 1608-52. It is concluded that the anisotropic models are well-behaved as they fulfill the necessary requirements for lower as well as higher values of the decoupling parameter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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