arXiv 1802.094472018-02astro-ph.COgr-qc

暗扇区模型的引力波约束

Gravitational wave constraints on dark sector models

Richard A. Battye, Francesco Pace, Damien Trinh

备注：: 10 pages
发表信息：: Phys. Rev. D 98, 023504 (2018)
DOI：: 10.1103/PhysRevD.98.023504

摘要：

我们探讨了最近观测到的符合引力波和伽马射线从一个二进制中子星合并，GW 170817暗扇区模型的约束。而不是专注于特定的模型已被认为是由其他作者，我们探讨这一点的情况下，状态方程的方法，其中特定的模型是特殊情况。在确认了Horndeski，Einstein-Aether和大质量引力模型的强约束之后，我们讨论了如何构建可能避开GW 170817的约束但仍然导致宇宙学上有趣的引力修正的模型。可能的例子是"奇迹取消”，如在$f(R)$模型，非局部模型和高阶导数。后两者依赖于观测到的引力波的波数与哈勃膨胀率的无量纲比非常大（$\sim10^{19}$），该比值用于抑制对引力波速度的修改。

英文摘要：

We explore the constraints on dark sector models imposed by the recent observation of coincident gravitational waves and gamma rays from a binary neutron star merger, GW170817. Rather than focusing on specific models as has been considered by other authors, we explore this in the context of the equation of state approach of which the specific models are special cases. After confirming the strong constraints found by others for Horndeski, Einstein-Aether and massive gravity models, we discuss how it is possible to construct models which might evade the constraints from GW170817 but still leading to cosmologically interesting modifications to gravity. Possible examples are ``miracle cancellations" such as in $f(R)$ models, nonlocal models and higher-order derivatives. The latter two rely on the dimensionless ratio of the wave number of the observed gravitational waves to the Hubble expansion rate being very large ($\sim10^{19}$) which is used to suppress modifications to the speed of gravitational waves.

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