Extended cuscuton as dark energy
Extended cuscuton as dark energy
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DOI：
10.1088/1475-7516/2020/07/004
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发表时间：
2020-03
影响因子：
6.4
通讯作者：
Aya Iyonaga;Kazufumi Takahashi;Tsutomu Kobayashi
中科院分区：
文献类型：
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作者：
Aya Iyonaga;Kazufumi Takahashi;Tsutomu Kobayashi
研究了扩展cuscuton理论中的晚时宇宙学，在该理论中，引力被修正，而除了两个张量模之外，仍然没有额外的动力自由度。我们提出一个简单的例子，承认宇宙背景演化的解析解，模拟ΛCDM宇宙学。我们认为扩展的蚀层作为暗能量可以像通常的标量张量理论一样，受到物质密度摄动的增长历史和牛顿常数的时间变化的约束。
Late-time cosmology in the extended cuscuton theory is studied, in which gravity is modified while one still has no extra dynamical degrees of freedom other than two tensor modes. We present a simple example admitting analytic solutions for the cosmological background evolution that mimics ΛCDM cosmology. We argue that the extended cuscuton as dark energy can be constrained, like usual scalar-tensor theories, by the growth history of matter density perturbations and the time variation of Newton's constant.