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arXiv 2106.09520gr-qc
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暗能量星的Einstein-Gauss-Bonnet引力理论模型

A theoretical model of Dark Energy Stars in Einstein-Gauss-Bonnet Gravity

M. Malaver, H. D. Kasmaei, R. Iyer, S. Sadhukhan, A. Kar

摘要:

暗能量星的研究是一个非常感兴趣的问题,因为最近的天文观测,关于测量遥远的超新星,宇宙微波背景和弱引力透镜证实,宇宙正在经历一个阶段的加速膨胀,这种宇宙学行为是由宇宙流体的存在,具有强大的负压,可以解释膨胀的宇宙。本文在EGB引力框架下,考虑负各向异性压力和状态方程pr=ω \r{ho}(其中pr为径向压力,ω为暗能量参数,\r{ho}为暗能量密度),得到了新的相对论恒星构型.我们选择了Korkina-Orlyanskii(1991)提出的度量势的一个修正形式。对于新的解决方案,我们检查了径向压力,度量系数,能量密度和各向异性是定义良好的,是经常在内部的恒星和依赖的高斯-邦纳耦合常数的值。所得到的解可用于发展满足所有物理可接受条件的暗能量星模型,但不能满足因果条件和强能量条件。

英文摘要:

Dark energy stars research is an issue of great interest since recent astronomical observations with respect to measurements in distant supernovas, cosmic microwave background and weak gravitational lensing confirm that the universe is undergoing a phase of accelerated expansion and this cosmological behavior is caused by the presence of a cosmic fluid which has a strong negative pressure that allows to explain the expanding universe. In this paper, we obtained new relativistic stellar configurations within the framework of Einstein-Gauss-Bonnet (EGB) gravity considering negative anisotropic pressures and the equation of state pr=ω\r{ho} where pr is the radial pressure, ω is the dark energy parameter, and \r{ho} is the dark energy density. We have chosen a modified version of metric potential proposed by Korkina-Orlyanskii (1991). For the new solutions we checked that the radial pressure, metric coefficients, energy density and anisotropy are well defined and are regular in the interior of the star and are dependent of the values of the Gauss-Bonnet coupling constant. The solutions found can be used in the development of dark energy stars models satisfying all physical acceptability conditions, but the causality condition and strong energy condition cannot be satisfied.

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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