论文标题
来自一阶相变和重力波的域壁网络
Domain wall networks from first-order phase transitions and gravitational waves
论文作者
论文摘要
在一阶相变（PTS）中，碰撞气泡是重要的引力波（GW）源。气泡碰撞后，由于与electroweak或更高尺度上的新物理学相关的离散对称性破坏了离散对称性，因此可以形成域壁。使用晶格模拟，我们研究了域壁的动态演化，发现域壁的网络围绕PT的完成围绕，并且壁网的寿命在很大程度上取决于真正真空的退化。我们的数值结果表明，域壁网络继续在PT之后产生GWS，从而极大地改变了光谱形状，并将幅度提高了大约一个阶。由此产生的GW功率谱以$ kr_* \simeqπ$达到顶峰，在峰值波数上方，它的衰减功率定律接近$ k^{ - 1.2} $，然后在$ kr_* \ sim \ sim \ sim \ Mathcal {o}（10^2）（10^2）（10^2）（10^2）$ kr_* \ sim \ sim \ sim $}的高原下缓慢降低高原。
In the first-order phase transitions (PTs) colliding bubble is an important gravitational wave (GW) source. Following bubble collision, domain walls can be formed when degenerate vacua occur as a result of the breaking of a discrete symmetry relevant to new physics at electroweak or higher scales. Using lattice simulations, we study the dynamical evolution of domain walls and find that the networks of the domain wall are formed around the completion of PTs and the lifetime of the wall networks largely depends on whether or not the degeneracy of true vacua is broken. Our numerical results indicate that domain wall networks continue to produce GWs in the aftermath of PTs, leading to dramatically changing the spectral shape and enhancing the magnitude by about one order. The resulting GW power spectra are peaked at $kR_* \simeq π$, above the peak wavenumber it has a decaying power law close to $k^{-1.2}$ followed by a slowly decreasing plateau with the UV cutoff at $kR_* \sim \mathcal{O}(10^2)$
