arXiv 2008.106002020-08gr-qc

利用嵌入方法研究Brans-Dicke引力中带质量标量场的荷电各向异性奇异星

Charged anisotropic strange stars in Brans-Dicke gravity with a massive scalar field through embedding approach

S. K. Maurya, Ksh. Newton Singh, M. Govender, Abdelghani Errehymy

备注：: 9 figures and 6 tables

摘要：

在这篇文章中，我们寻求的Einstein-Maxwell场方程的解决方案中存在的一个大规模的标量场铸造在Brans-Dicke（BD）形式主义，描述了带电各向异性奇怪的明星。内部时空由嵌入类I的球对称静态度规描述。这减少了问题，以一个单一的生成函数的度量的潜力，这是通过呼吁物理学的基础上，在每个内部点的恒星内部的规律性选择。由此产生的模型受到严格的物理检查的基础上的稳定性，因果关系和规律性。我们表明，我们的解决方案描述紧凑的对象，如PSR J1903+327; Cen X-3; EXO 1785-248 \& LMC X-4到一个很好的近似。新的研究结果表明，标量场导致更高的表面电荷密度，这反过来又会影响的紧凑性和上限和下限值所施加的修改Buchdahl限制带电星。我们的结果还表明，电场和标量场，这是从完全不同的来源耦合，以改变物理特性，如质量半径关系和表面红移的紧凑的对象。这种电场和标量场的叠加通过BD耦合常数$ω_{BD}$的增加而增强。

英文摘要：

In this exposition, we seek solutions of the Einstein-Maxwell field equations in the presence of a massive scalar field cast in the Brans-Dicke (BD) formalism which describes charged anisotropic strange stars. The interior spacetime is described by a spherically symmetric static metric of embedding class I. This reduces the problem to a single-generating function of the metric potential which is chosen by appealing to physics based on regularity at each interior point of the stellar interior. The resulting model is subjected to rigorous physical checks based on stability, causality and regularity. We show that our solutions describe compact objects such as PSR J1903+327; Cen X-3; EXO 1785-248 \& LMC X-4 to an excellent approximation. Novel results of our investigation reveal that the scalar field leads to higher surface charge densities which in turn affects the compactness and upper and lower values imposed by the modified Buchdahl limit for charged stars. Our results also show that the electric and scalar fields which originate from entirely different sources couple to alter physical characteristics such as mass-radius relation and surface redshift of compact objects. This superposition of the electric and scalar fields is enhanced by an increase in the BD coupling constant, $ω_{BD}$.

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。

摘要：

英文摘要：

相关论文