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arXiv 1306.5694gr-qcastro-ph.CO
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F(R)引力和引力排斥的球对称解

Spherically Symmetric Solutions in F(R) Gravity and Gravitational Repulsion

E. V. Arbuzova, A. D. Dolgov, L. Reverberi

摘要:

本文研究了具有上升能量密度的天文系统的F(R)理论球对称解。参数的范围内建立的背景度量的平坦时空近似是有效的。对于曲率标量以大振幅和高频率振荡的解决方案,在我们以前的论文中发现,它表明,分析的Jeans不稳定性是强烈修改。研究发现,对于大型天体,修正引力可以是排斥性的,因此这些天体收缩形成相对薄的壳,而不是准均匀体。这也许可以解释宇宙空洞的形成。

英文摘要:

Spherically symmetric solutions in F(R) theories in astronomical systems with rising energy density are studied. The range of parameters is established for which the flat space-time approximation for the background metric is valid. For the solutions in which the curvature scalar oscillates with large amplitude and high frequency, found in our previous papers, it is shown that the analysis of the Jeans instability is strongly modified. It is discovered that for large astronomical objects modified gravity can be repulsive, so such objects shrink forming relatively thin shells instead of quasi uniform bodies. This may explain the formation of cosmic voids.

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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