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arXiv 2003.01934gr-qcastro-ph.CO
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作为暗能量的扩展Cuscuton

Extended Cuscuton as Dark Energy

Aya Iyonaga, Kazufumi Takahashi, Tsutomu Kobayashi

摘要:

研究了扩展的库斯库顿理论中的晚时宇宙学,其中引力被修正,但除了两个张量模外,仍然没有额外的动力学自由度。我们提出了一个简单的例子承认解析解的宇宙学背景演化,模仿$Λ$ CDM宇宙学。我们认为,扩展的cuscuton作为暗能量可以限制,像通常的标量张量理论,由物质密度扰动的增长历史和牛顿常数的时间变化。

英文摘要:

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 $Λ$CDM 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.

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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