Abstract
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.
Highlights
The gravitational wave (GW) observations enable us to test gravity theory in strong and dynamical regimes of gravity
While a neutrino is emitted at t = te + τint with some intrinsic time delay τint and is detected at t = te + τint + Tν, where Tν is the neutrino propagation time
The observable is the difference of the arrival times between the GW and the neutrino
Summary
RELATIVISTIC SIMULATIONS OF BLACK HOLE–NEUTRON STAR COALESCENCE: THE JET EMERGES. Journal of Physics: Conference Series 716 (2016) 012018 doi:10.1088/1742-6596/716/1/012018. Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena, California
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