Tests of general relativity using multiband observations of intermediate mass binary black hole mergers
Tests of general relativity using multiband observations of intermediate mass binary black hole mergers
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DOI：
10.1103/physrevd.103.024036
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发表时间：
2020-06
影响因子：
5
通讯作者：
S. Datta;Anuradha Gupta;S. Kastha;K. Arun;B. Sathyaprakash
中科院分区：
文献类型：
--
作者：
S. Datta;Anuradha Gupta;S. Kastha;K. Arun;B. Sathyaprakash
引力波在两个不同频段的观测称为多频段引力波天文学。随着计划中的激光干涉测量空间天线(LISA)在10^-4-0.1美元赫兹范围内工作，以及第三代(3G)地面探测器(如宇宙探索者(CE)和爱因斯坦望远镜(ET))在1美元-10^4美元赫兹范围内工作，多频段GW天文学可能在大约10年内成为现实。本文介绍了分量质量为10^2--10^3M的中等质量双黑洞(IMBBH)多带观测的可能性，以检验广义相对论。我们表明，对IMBBH的多波段观测将允许对GR进行多参数测试-同时测量多个后牛顿(PN)系数的测试产生了对GR可能修改的更严格的约束。我们还发现，多频带带来的改善往往比两个观测站的最佳边界要大得多。这一结果的起源，正如我们将演示的那样，可以追溯到当来自LISA和3G的信息被放在一起时，各种参数之间的简并被解除。我们得到了总红移质量为200M，质量比为2的IMBBH的最佳多带界。对于单参数测试，这个系统在1 GPC时允许我们将所有PN系数的偏差限制在10以下，并得到前7个PN系数的同时界到50以下(自旋较低)。
Observation of gravitational waves (GWs) in two different frequency bands is referred to as {\it multiband GW astronomy}. With the planned Laser Interferometric Space Antenna (LISA) operating in the $10^{-4}-0.1$ Hz range, and third generation (3G) ground-based detectors such as the Cosmic Explorer (CE) and Einstein Telescope (ET), operating in the $1$--$10^4$ Hz range, multiband GW astronomy could be a reality in about a decade. In this paper we present the potential of multiband observations of intermediate mass binary black holes (IMBBHs) of component masses ${\sim}10^2$--$10^3M_{\odot}$ to test general relativity (GR). We show that mutiband observations of IMBBHs would permit multiparameter tests of GR---tests where more than one post-Newtonian (PN) coefficient is simultaneously measured yielding more rigorous constraints on possible modifications to GR. We also find that the improvement due to multibanding can often be much larger than the best of the bounds from either of the two observatories. The origin of this result, as we shall demonstrate, can be traced to the lifting of degeneracies among the various parameters when the information from LISA and 3G are taken together. We obtain the best multiband bounds for an IMBBH with a total redshifted mass of $200M_{\odot}$ and a mass ratio of 2. For single-parameter tests, this system at 1 Gpc would allow us to constrain the deviations on all the PN coefficients to below 10\% and derive simultaneous bounds on the first seven PN coefficients to below 50\% (with low spins).