Mass-varying massive gravity
Mass-varying massive gravity
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DOI：
10.1103/physrevd.86.124014
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发表时间：
2012-06
影响因子：
5
通讯作者：
Q. Huang;Yun-song Piao;Shuang-Yong Zhou
中科院分区：
文献类型：
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作者：
Q. Huang;Yun-song Piao;Shuang-Yong Zhou
最近的研究表明，引力子可以在不引入Boulware-Deser鬼的情况下始终获得恒定的质量。我们提出了一个引力模型的引力子质量是由一个标量场，并证明了这个模型是免费的Boulware-Deser鬼通过分析其约束系统，并显示两个约束条件出现。我们还对该模型的宇宙背景演化进行了初步研究，并初步讨论了该模型可能的宇宙学意义。特别是，我们考虑一个简单的情况下，标量场设置的引力子质量与暴胀子和引力子质量从高到低的能量尺度演变，引起当前的宇宙加速。
It has recently been shown that the graviton can consistently gain a constant mass without introducing the Boulware-Deser ghost. We propose a gravity model where the graviton mass is set by a scalar field and prove that this model is free of the Boulware-Deser ghost by analyzing its constraint system and showing that two constraints arise. We also initiate the study of the model's cosmic background evolution and tentatively discuss possible cosmological implications of this model. In particular, we consider a simple scenario where the scalar field setting the graviton mass is identified with the inflaton and the graviton mass evolves from a high to a low energy scale, giving rise to the current cosmic acceleration.