Relativistic stars in f(R) gravity, and absence thereof
Relativistic stars in f(R) gravity, and absence thereof
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DOI：
10.1103/physrevd.78.064019
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发表时间：
2008-09-01
影响因子：
5
通讯作者：
Maeda, Kei-ichi
中科院分区：
文献类型：
--
作者：
Kobayashi, Tsutomu;Maeda, Kei-ichi
提出了几种f(R)修正引力模型，实现了正确的宇宙演化，满足太阳系和实验室测试。尽管可以构建非相对论性恒星结构，但我们认为相对论性恒星不能出现在此类 f(R) 理论中。这个问题的出现是由于强重力状态下有效标量自由度的动力学。因此，我们的主张对 f(R) 模型的可行性提出了质疑。
Several f(R) modified gravity models have been proposed which realize the correct cosmological evolution and satisfy solar system and laboratory tests. Although nonrelativistic stellar configurations can be constructed, we argue that relativistic stars cannot be present in such f(R) theories. This problem appears due to the dynamics of the effective scalar degree of freedom in the strong gravity regime. Our claim thus raises doubts on the viability of f(R) models.