太阳系对f（G）暗能量的限制
Solar System Constraints on f(G) Dark Energy
摘要：
在f（G）引力理论中，在引力作用量中加入了高斯-邦纳曲率项的函数，导出了太阳系引力修正。它们对牛顿定律的影响，正如行星所感受到的那样，以及对卡西尼号航天器信号的频移的影响，都是确定的。尽管高斯-博内项的曲率是二次的，但由此产生的约束是相当大的。结果表明，它们实际上排除了f（G）作为宇宙晚期加速的自然解释。可能的例外是当f（G）简化为非常接近于宇宙学常数时，或者如果函数f的形式被特别地微调。
英文摘要：
Corrections to solar system gravity are derived for f(G) gravity theories, in which a function of the Gauss-Bonnet curvature term is added to the gravitational action. Their effects on Newton's law, as felt by the planets, and on the frequency shift of signals from the Cassini spacecraft, are both determined. Despite the fact that the Gauss-Bonnet term is quadratic in curvature, the resulting constraints are substantial. It is shown that they practically rule out f(G) as a natural explanation for the late-time acceleration of the universe. Possible exceptions are when f(G) reduces to something very close to a cosmological constant, or if the form of the function f is exceptionally fine-tuned.
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