Collett Thomas E, Bacon David
Institute of Cosmology and Gravitation, University of Portsmouth, Burnaby Road, Portsmouth PO1 3FX, United Kingdom.
Phys Rev Lett. 2017 Mar 3;118(9):091101. doi: 10.1103/PhysRevLett.118.091101. Epub 2017 Mar 2.
Probing the relative speeds of gravitational waves and light acts as an important test of general relativity and alternative theories of gravity. Measuring the arrival time of gravitational waves (GWs) and electromagnetic (EM) counterparts can be used to measure the relative speeds, but only if the intrinsic time lag between emission of the photons and gravitational waves is well understood. Here we suggest a method that does not make such an assumption, using future strongly lensed GW events and EM counterparts; Biesiada et al. [J. Cosmol. Astropart. Phys.10 (2014) 080JCAPBP1475-751610.1088/1475-7516/2014/10/080] forecast that 50-100 strongly lensed GW events will be observed each year with the Einstein Telescope. A single strongly lensed GW event would produce robust constraints on c_{GW}/c_{γ} at the 10^{-7} level, if a high-energy EM counterpart is observed within the field of view of an observing γ-ray burst monitor.
探究引力波和光的相对速度是对广义相对论及其他引力理论的一项重要检验。测量引力波（GWs）和电磁（EM）对应体的到达时间可用于测量相对速度，但前提是要清楚光子和引力波发射之间的固有时间延迟。在此，我们提出一种不做此类假设的方法，利用未来强引力透镜GW事件及其电磁对应体；比耶西亚达等人[《宇宙学与天体粒子物理学杂志》10（2014）080，JCAPBP1475 - 7516，10.1088/1475 - 7516/2014/10/080]预测，使用爱因斯坦望远镜每年将观测到50 - 100个强引力透镜GW事件。如果在观测伽马射线暴监测器的视场内观测到高能电磁对应体，单个强引力透镜GW事件将对(c_{GW}/c_{γ})产生(10^{-7})水平的有力限制。
