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arXiv 2010.04047gr-qcastro-ph.CO
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基于GW170817和GW190521的引力波摩擦

Gravitational wave friction in light of GW170817 and GW190521

S. Mastrogiovanni, L. Haegel, C. Karathanasis, I. Magana-Hernandez, D. A. Steer

摘要:

我们使用引力波(GW)事件GW 170817和GW 190521,连同他们的建议电磁对应物,约束宇宙学参数和引力理论超越广义相对论(GR)。特别是,我们考虑模型随时间变化的普朗克质量,大额外的维度,和一个唯象的参数化,涵盖了几个超越GR理论。在所有三种情况下,这都将摩擦项引入GW传播方程,有效地修改了GW的光度距离。我们设置约束$Λ$ CDM参数和GR偏差参数使用两套先验的哈勃常数和物质能量密度。通过将先验值设置为测量的普朗克任务值,我们发现,通过包含GW 190521,两个GR偏差参数约束改善了一个因子$\sim 10$,我们报告了许多与$4$兼容的时空维度,精度为$2.5\%$(在95\% CL),并且在GW 170817 $<20\%$的时期内顿常数变化的上限。与广泛的先验的哈勃常数和物质能量密度,我们表明,它仍然是可能的约束$Λ$ CDM参数和GR偏差参数联合从GW170817和GW190521获得约束GR偏差参数,这是一个因素$2-6$差于使用限制先验的结果$Λ$ CDM参数。

英文摘要:

We use the gravitational wave (GW) events GW170817 and GW190521, together with their proposed electromagnetic counterparts, to constrain cosmological parameters and theories of gravity beyond General Relativity (GR). In particular we consider models with a time-varying Planck mass, large extra-dimensions, and a phenomenological parametrization covering several beyond-GR theories. In all three cases, this introduces a friction term into the GW propagation equation, effectively modifying the GW luminosity distance. We set constraints on $Λ$CDM parameters and GR deviation parameters using two sets of priors on the Hubble constant and matter energy density. With priors set to the measured Planck's mission values, we find that with the inclusion of GW190521, the two GR deviation parameters constraints improves by a factor $\sim 10$, we report a number of spacetime dimensions compatible with $4$ with an precision of $2.5\%$ (at 95\% CL) and an upper limit to the variation of Netwon's constant at the epoch of GW170817 $<20\%$. With wide priors on the Hubble constant and matter energy density, we show that it is still possible to constrain the $Λ$CDM parameters and GR deviation parameters conjointly from GW170817 and GW190521 obtaining constraints on GR deviation parameters which are a factor $2-6$ worse than the results using restricted priors on $Λ$CDM parameters.

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