论文标题
气泡碰撞的重力波和强冷相变的流体运动
Gravitational waves from bubble collisions and fluid motion in strongly supercooled phase transitions
论文作者
论文摘要
我们估计通过气泡碰撞和流体运动在强冷的相变中产生的重力波光谱。我们在薄壁近似中分析得出确定标量场和流体之间过渡中释放的能量份额的效率因子。我们对气泡表面上的所有点分别执行了数值模拟，包括效率因子作为气泡半径的函数，以考虑其不同的碰撞时间。我们发现，效率因子并未显着改变重力波谱，并表明可以通过将没有效率因子获得的光谱乘以在半径$ r _ {\ rm eff} \ simeq 5/β$的情况下近似效率因子来近似效率。我们还提供了更新的拟合，以根据碰撞后的源头和流体运动产生的强烈冷过渡和流体运动产生的重力波光谱。
We estimate the gravitational wave spectra generated in strongly supercooled phase transitions by bubble collisions and fluid motion. We derive analytically in the thin-wall approximation the efficiency factor that determines the share of the energy released in the transition between the scalar field and the fluid. We perform numerical simulations including the efficiency factor as a function of bubble radius separately for all points on the bubble surfaces to take into account their different collision times. We find that the efficiency factor does not significantly change the gravitational wave spectra and show that the result can be approximated by multiplying the spectrum obtained without the efficiency factor by its value at the radius $R_{\rm eff} \simeq 5/β$, where $β$ is the approximate inverse duration of the transition. We also provide updated fits for the gravitational wave spectra produced in strongly supercooled transitions from both bubble collisions and fluid motion depending on the behaviour of the sources after the collision.
