论文标题
随机重力波背景的音速共振
Sound speed resonance of the stochastic gravitational wave background
论文作者
论文摘要
我们提出了一种新的机制，可以根据GWS天文学测试重力波（GWS）传播速度的时间变化。随机GWS经历了宇宙扩张的整个历史，它们编码了这种差异的潜在观察证据。我们报告说，不同的GWS速度的一个特征是，如果GWS速度在高能尺度上及时振荡，GWS的能量范围将呈现增强的峰值。这种振荡行为是在广泛的修改性重力理论中产生的。这些峰的幅度可以通过当前和即将到来的GWS仪器达到范围，因此使基本理论可伪造。这种机制表明，探测GWS速度的变化可能是寻找超出一般相对性的新物理学的一种有希望的方法。
We propose a novel mechanism to test time variation of the propagation speed of gravitational waves (GWs) in light of GWs astronomy. As the stochastic GWs experience the whole history of cosmic expansion, they encode potential observational evidence of such variation. We report that, one feature of a varying GWs speed is that the energy spectrum of GWs will present resonantly-enhanced peaks if the GWs speed oscillates in time at high-energy scales. Such oscillatory behaviour arises in a wide class of modified gravity theories. The amplitude of these peaks can be at reach by current and forthcoming GWs instruments, hence making the underlying theories falsifiable. This mechanism reveals that probing the variation of GWs speed can be a promising way to search for new physics beyond general relativity.
