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arXiv 1406.5544gr-qcastro-ph.COhep-th
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用致密双星合并和超新星的光子和中微子测量引力波的速度

Measuring Speed of Gravitational Waves by Observations of Photons and Neutrinos from Compact Binary Mergers and Supernovae

Atsushi Nishizawa, Takashi Nakamura

摘要:

引力波的探测为我们提供了一个在强引力和动力学体系中检验广义相对论的机会。测试之一是检查GW是否以光速传播。这个测试是至关重要的,因为GW的速度从来没有被直接测量过。由于引力、引力子质量以及额外维度和量子引力效应等非平凡时空结构的改变,GW的传播速度可能偏离光速。在这里,我们报告了一个简单的方法来测量GW的传播速度直接比较之间的到达时间引力波,从超新星中微子或短伽马射线暴的光子。结果表明,未来对GW、中微子和光子的多信使观测可以将GW传播速度的测量精度提高到~10^{-16},比以前的建议提高了8-10个数量级。我们还提出了一种新的方法,区分真正的信号,由于GW的传播速度从光速和固有的时间延迟的发射源的偏离通过看红移的依赖性。

英文摘要:

Detection of gravitational waves (GW) provides us an opportunity to test general relativity in strong and dynamical regimes of gravity. One of the tests is checking whether GW propagates with the speed of light or not. This test is crucial because the velocity of GW has not ever been directly measured. Propagation speed of a GW can deviate from the speed of light due to the modification of gravity, graviton mass, and the nontrivial spacetime structure such as extra dimensions and quantum gravity effects. Here we report a simple method to measure the propagation speed of a GW by directly comparing arrival times between gravitational waves, and neutrinos from supernovae or photons from short gamma-ray bursts. As a result, we found that the future multimessenger observations of a GW, neutrinos, and photons can test the GW propagation speed with the precision of ~10^{-16} improving the previous suggestions by 8-10 orders of magnitude. We also propose a novel method that distinguishes the true signal due to the deviation of GW propagation speed from the speed of light and the intrinsic time delay of the emission at a source by looking at the redshift dependence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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