论文标题
最小修饰的重力拟合planck数据比$λ$ cdm更好
Minimally Modified Gravity fitting Planck data better than $Λ$CDM
论文作者
论文摘要
我们研究称为$ f（\ Mathcal {h}）$理论的一类微型重力理论的现象学，其中通常的一般相对论的哈密顿约束被其自由函数所取代。在回顾了理论的构建和一致的物质耦合之后，我们分析了背景和扰动层面的宇宙学动力学，并提供了该理论的具体示例，该函数$ f $ $ 3 $ - 参数家族。最后，我们将此示例模型与Planck数据以及一些以后的探针进行了比较，这表明这种实现$ f（\ Mathcal {h}）$理论的理论明显比标准的$λ$ CDM模型更适合数据，尤其是通过修改InterMediate Redshifts，$ z \ simeq743 $的重力。
We study the phenomenology of a class of minimally modified gravity theories called $f(\mathcal{H})$ theories, in which the usual general relativistic Hamiltonian constraint is replaced by a free function of it. After reviewing the construction of the theory and a consistent matter coupling, we analyze the dynamics of cosmology at the levels of both background and perturbations, and present a concrete example of the theory with a $3$-parameter family of the function $f$. Finally, we compare this example model to Planck data as well as some later-time probes, showing that such a realization of $f(\mathcal{H})$ theories fits the data significantly better than the standard $Λ$CDM model, in particular by modifying gravity at intermediate redshifts, $z\simeq743$.
