论文标题
流体运动和声学引力波记忆的固有非线性
Inherent nonlinearity of fluid motion and acoustic gravitational wave memory
论文作者
论文摘要
我们认为在静止时出现了完美的流体中非线性声波的传播。通过在一个空间尺寸中采用非线性声学的Riemann波方程，表明在其尾部携带恒密度扰动的波会产生重力波记忆的声学模拟。对于通常是$ nonelear $的声学记忆，有效时空动力学的非线性不是由于爱因斯坦方程，而是由于完美流体方程的非线性。为了具体，我们采用了被盒子捕获的Bose-Einstein冷凝物，并提出了一种实验方案来观察声学引力波记忆。
We consider the propagation of nonlinear sound waves in a perfect fluid at rest. By employing the Riemann wave equation of nonlinear acoustics in one spatial dimension, it is shown that waves carrying a constant density perturbation at their tails produce an acoustic analogue of gravitational wave memory. For the acoustic memory, which is in general $nonlinear$, the nonlinearity of the effective spacetime dynamics is not due to the Einstein equations, but due to the nonlinearity of the perfect fluid equations. For concreteness, we employ a box-trapped Bose-Einstein condensate, and suggest an experimental protocol to observe acoustic gravitational wave memory.
