论文标题
瀑布僵硬的时期可以产生可观察的原始引力波
Waterfall stiff period can generate observable primordial gravitational waves
论文作者
论文摘要
研究了一个玩具模型，该玩具模型考虑了在增强的对称点上的两个平坦方向会议，以便他们意识到通常的混合膨胀机制。瀑布场的动力学术语在其Planckian真空期望值（VEV）上具有杆子，就像$α$ - 吸收器一样。因此，在终止混合膨胀的相转换后，瀑布场永远不会滚动到其VEV上。取而代之的是，它驱动了一个僵硬的时期，其中宇宙的正压参数$ w \大约1/2 $导致原始引力波频谱的峰值，这将由即将到来的Lisa任务以及Advanced Ligo观察到。
A toy-model is studied, which considers two flat directions meeting at an enhanced symmetry point such that they realise the usual hybrid inflation mechanism. The kinetic term of the waterfall field features a pole at its Planckian vacuum expectation value (VEV), as with $α$-attractors. Consequently, after the phase transition which terminates hybrid inflation, the waterfall field never rolls to its VEV. Instead, it drives a stiff period, where the barotropic parameter of the Universe $w\approx 1/2$ results in a peak in the spectrum of primordial gravitational waves, which will be observable by the forthcoming LISA mission as well as by Advanced LIGO.
