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arXiv 2005.13972astro-ph.COgr-qchep-th
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最小修正重力拟合普朗克数据优于$Λ$ CDM

Minimally Modified Gravity fitting Planck data better than $Λ$CDM

Katsuki Aoki, Antonio De Felice, Shinji Mukohyama, Karim Noui, Michele Oliosi, Masroor C. Pookkillath

摘要:

研究了一类称为$f(\mathcal{H})$理论的最小修正引力理论的唯象性,在这种理论中,通常的广义相对论哈密顿约束被它的自由函数所取代.在回顾了理论的构造和相容的物质耦合之后,我们分析了背景和微扰两个层次上的宇宙动力学,并提出了一个具体的例子,该理论与$3$参数家庭的功能$f$。最后,我们比较这个例子模型的普朗克数据,以及一些后来的时间探针,表明这种实现的$f(\mathcal{H})$理论符合数据显着优于标准的$Λ$ CDM模型,特别是通过修改重力在中等红移,$z\simeq743$。

英文摘要:

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, $z\simeq743$.

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