arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.12686gr-qcastro-ph.GA
收藏

爱因斯坦引力背景下Tolman-Kuchowicz时空中的暗能量星

Dark Energy Stars in Tolman-Kuchowicz spacetime in the context of Einstein Gravity

Piyali Bhar

摘要:

暗能量是目前宇宙中丰度最大的成分,它是宇宙加速膨胀的原因。因此,暗能量很可能与任何致密天体相互作用[Muhammad F.A.R. Sakti和Anto Sulaksono,{ \it Phys. Rev. D} { \bf 103},084042(2021)]。在本文中,我们提出了一个由暗物质和普通物质组成的暗能量星模型,其中暗能量的密度与各向同性理想流体物质的密度成正比。在广义相对论的背景下,该模型是在弯曲的托尔曼-库乔维奇时空几何中导出的[托尔曼,物理学评论55:364,(1939);库乔维奇,物理学学报33:541,(1968)]。在这里,我们看看暗能量如何影响恒星质量,紧凑性和平衡等模型的物理参数,例如,研究了压力、密度、质量函数、表面红移等,并详细研究了恒星位形的稳定性。该模型具有有趣的性质,因为它满足所有的能量准则,并且没有中心奇点。利用$M-R$图,从模型中得到了最大允许质量。我们分析了模型的许多物理特性,并检查了它是否满足所有规则性约束,是否稳定,因此在物理上是真实的。

英文摘要:

Dark energy is the component in the present Universe with the greatest abundance, and it is responsible for the accelerating expansion of the Universe. As a result, dark energy is likely to interact with any compact astrophysical object [Muhammad F.A.R. Sakti and Anto Sulaksono, {\it Phys. Rev. D} {\bf 103}, 084042 (2021)]. In present paper, we propose a model for a dark energy star made up of dark and ordinary matter in which the density of dark energy is proportional to the density of isotropic perfect fluid matter. In the context of general relativity, the model is derived in the curved Tolman-Kuchowicz spacetime geometry [Tolman, Phys Rev 55:364, (1939); Kuchowicz, Acta Phys Pol 33:541, (1968)]. Here, we look at how dark energy affects stellar mass, compactness, and equilibrium etc. The physical parameters of the model e.g., pressure, density, mass function, surface redshift etc. are investigated, and the stability of stellar configuration is studied in detail. The model has interesting properties because it meets all energy criteria and is free from central singularities. The maximum allowable mass has been obtained from our model with the help of $M-R$ diagram. We analyse many physical properties of the model and checked that it meets all regularity constraints, is stable, and therefore physically realistic.

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。

↑