arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.01593astro-ph.COgr-qchep-th
收藏

用LISA标准警报器在宇宙学距离上测试修正引力

Testing modified gravity at cosmological distances with LISA standard sirens

E. Belgacem, G. Calcagni, M. Crisostomi, C. Dalang, Y. Dirian, J. M. Ezquiaga, M. Fasiello, S. Foffa, A. Ganz, J. Garcia-Bellido, L. Lombriser, M. Maggiore, N. … 展开作者

E. Belgacem, G. Calcagni, M. Crisostomi, C. Dalang, Y. Dirian, J. M. Ezquiaga, M. Fasiello, S. Foffa, A. Ganz, J. Garcia-Bellido, L. Lombriser, M. Maggiore, N. Tamanini, G. Tasinato, M. Zumalacarregui, E. Barausse, N. Bartolo, D. Bertacca, A. Klein, S. Matarrese, M. Sakellariadou

摘要:

广义相对论的修正通过非平凡的暗能量状态方程在宇宙膨胀历史上留下了印记,并在标量和张量扇区中的宇宙学扰动演化上留下了印记。特别是,张量扇区的修改产生了引力波(GW)光度距离的概念,与标准电磁光度距离不同,可以在GW探测器(如LISA或第三代地面实验)上使用标准警报器进行研究。我们讨论了一些最好的研究理论的修改重力,如Horndeski或更一般的退化高阶标量张量(DHOST)理论,非本地红外修改的重力,双引力理论和相应的现象GW振荡,以及理论与额外的或不同的维度的修改GW传播的预测。我们表明,修改GW传播是一个完全通用的现象,在修改重力。然后,我们使用两个参数$(Ξ_0,n)$,这是一个简单的参数化的效果,这是适合从一个大类的模型的结果,研究的前景,观察修改GW的传播使用超大质量黑洞二进制作为标准的警报与LISA。我们构建模拟源目录,并进行详细的马尔可夫链蒙特卡罗研究的可能性从LISA标准警报器单独,以及通过将它们与CMB,BAO和SNe数据相结合,以减少宇宙学参数之间的简并。我们发现,LISA与其他宇宙学数据集的组合允许一个测量参数$Ξ_0$,其特征修改GW传播的百分比水平的准确性,足以测试几个修改后的重力理论。[摘要]

英文摘要:

Modifications of General Relativity leave their imprint both on the cosmic expansion history through a non-trivial dark energy equation of state, and on the evolution of cosmological perturbations in the scalar and in the tensor sectors. In particular, the modification in the tensor sector gives rise to a notion of gravitational-wave (GW) luminosity distance, different from the standard electromagnetic luminosity distance, that can be studied with standard sirens at GW detectors such as LISA or third-generation ground based experiments. We discuss the predictions for modified GW propagation from some of the best studied theories of modified gravity, such as Horndeski or the more general degenerate higher order scalar-tensor (DHOST) theories, non-local infrared modifications of gravity, bigravity theories and the corresponding phenomenon of GW oscillation, as well as theories with extra or varying dimensions. We show that modified GW propagation is a completely generic phenomenon in modified gravity. We then use a simple parametrization of the effect in terms of two parameters $(Ξ_0,n)$, that is shown to fit well the results from a large class of models, to study the prospects of observing modified GW propagation using supermassive black hole binaries as standard sirens with LISA. We construct mock source catalogs and perform detailed Markov Chain Monte Carlo studies of the likelihood obtained from LISA standard sirens alone, as well as by combining them with CMB, BAO and SNe data to reduce the degeneracies between cosmological parameters. We find that the combination of LISA with the other cosmological datasets allows one to measure the parameter $Ξ_0$ that characterizes modified GW propagation to the percent level accuracy, sufficient to test several modified gravity theories. [Abridged]

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑