Probing the speed of gravity with LVK, LISA, and joint observations
Probing the speed of gravity with LVK, LISA, and joint observations
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DOI：
10.1007/s10714-022-03016-0
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发表时间：
2022-07
影响因子：
2.8
通讯作者：
I. Harry;J. Noller
中科院分区：
文献类型：
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作者：
I. Harry;J. Noller
暗能量理论影响宇宙学尺度上引力波的速度，自然会导致接近LIGO/Virgo/KAGRA（LVK）波段的速度依赖于频率的跃迁。虽然像GW 170817这样的观测向我们保证了在LVK波段非常接近光速，但在LVK波段以下的频率依赖性跃迁对于大类动态暗能量理论来说是一个冒烟的信号。在这里，我们讨论（1）如何用LVK带中的观测来约束这种跃迁的残余，（2）什么特征与丽莎带中的这种跃迁相关联，以及（3）LVK和丽莎带中的联合观测如何使我们能够对这种跃迁和基础理论施加严格的约束。我们发现，偏差的可以被约束到一个水平的LVK和LISA波段，即使是轻微的频率依赖性，比现有的频率无关的界限强得多。我们使用来自GW 170817的应变数据来限制在100 Hz和500 Hz下的偏差。我们还确定了一个特别有趣的类型之间的LVK和丽莎波段的过渡，并显示如何多波段观测可以进一步限制这一点。最后，我们讨论了这些当前和预测的约束意味着潜在的暗能量理论。
Theories of dark energy that affect the speed of gravitational waveson cosmological scales naturally lead to a frequency-dependent transition of that speed close to the LIGO/Virgo/KAGRA (LVK) band. While observations such as GW170817 assure us thatis extremely close to the speed of light in the LVK band, a frequency-dependent transition below the LVK band is a smoking-gun signal for large classes of dynamical dark energy theories. Here we discuss (1) how the remnants of such a transition can be constrained with observations in the LVK band, (2) what signatures are associated with such a transition in the LISA band, and (3) how joint observations in the LVK and LISA bands allow us to place tight constraints on this transition and the underlying theories. We find that deviations ofcan be constrained down to a level ofin the LVKandLISA bands even for mild frequency-dependence, much stronger than existing bounds for frequency-independent. We use the strain data from GW170817 to bound the deviation ofto be less thanat 100 Hz and less thanat 500 Hz. We also identify a particularly interesting type of transition in between the LVK and LISA bands and show how multi-band observations can constrain this further. Finally, we discuss what these current and forecasted constraints imply for the underlying dark energy theories.