倏逝引力波
Evanescent Gravitational Waves
摘要：
我们描述了消逝引力波（EGW）的性质--爱因斯坦方程的波解，它在某个方向上指数衰减，而在另一个方向上传播。倏逝波在声学和光学中是众所周知的，并且由于其特殊的性质，例如横向自旋和自旋-动量锁定，最近受到了广泛的关注。我们表明，EGW具有类似的显着性能，携带横向自旋角动量和驱动自由下落的测试质量沿椭圆轨迹。因此，测试质量在一个平面上的传播方向的横向表现出相关的矢量和标量的变形-相关性，可以用来区分它从修改重力。我们证明，EGW是存在的，并在附近的亚波长源，如轨道双星占主导地位。
英文摘要：
We describe the properties of evanescent gravitational waves (EGWs)---wave solutions of Einstein equations which decay exponentially in some direction while propagating in another. Evanescent waves are well-known in acoustics and optics and have recently received much attention due to their extraordinary properties such as their transverse spin and spin-momentum locking. We show that EGWs possess similarly remarkable properties, carrying transverse spin angular momenta and driving freely falling test masses along in elliptical trajectories. Hence, test masses on a plane transverse to the direction of propagation exhibit correlated vector and scalar-like deformation---correlations which can be used to distinguish it from modified gravity. We demonstrate that EGWs are present and dominant in the vicinity of sub-wavelength sources such as orbiting binaries.
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