Measuring Gravitational-Wave Propagation Speed with Multimessenger Observations

11th Edoardo Amaldi Conference on Gravitational Waves

Nishizawa, Atsushi^1 ; Nakamura, Takashi^2

Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena

CA

91125, United States^1

Department of Physics, Kyoto University, Kyoto

606-8502, Japan^2

关键词: Arrival time;    Cosmological distances;    Dynamical regime;    Gamma ray bursts;    GW propagation;    Orders of magnitude;    Propagation speed;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/716/1/012018/pdf
DOI  :  10.1088/1742-6596/716/1/012018

来源: IOP

【 摘 要 】

A measurement of gravitational wave (GW) propagation speed is one of important tests of gravity in a dynamical regime. We report a method to measure the GW propagation speed by directly comparing arrival times of GWs, neutrinos from supernovae (SN), and photons from short gamma-ray bursts (SGRB). We found that the future multimessenger observations can test the GW propagation speed with the precision of ∼ 10-16-10-15, improving the previous suggestions by 9 - 10 orders of magnitude. We also propose a novel method that distinguishes the true signal due to the deviation of GW speed from the speed of light and the intrinsic time delay with compact binaries at cosmological distances.