论文标题
延长的库斯卡顿作为暗能量
Extended Cuscuton as Dark Energy
论文作者
论文摘要
研究了扩展的库斯卡顿理论中的延迟宇宙学，其中重力被修改，而一个除两种张量模式以外的动态自由度仍然没有。我们提供了一个简单的示例，该示例是宇宙学背景演变的分析解决方案，该进化模仿$λ$ CDM宇宙学。我们认为，像通常的标量调整理论一样，可以通过物质密度扰动的生长历史和牛顿常数的时间变化来限制扩展的库斯卡顿作为暗能量的限制。
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.
