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arXiv 2208.07186hep-phastro-ph.COgr-qc
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一级相变和引力波的畴壁网络

Domain wall networks from first-order phase transitions and gravitational waves

Dongdong Wei, Yun Jiang

摘要:

在一级相变中,碰撞气泡是一个重要的引力波源。在磁泡碰撞之后,当在电弱或更高尺度下与新物理学相关的离散对称性被破坏而产生简并真空时,可以形成畴壁。利用晶格模拟研究了畴壁的动力学演化,发现畴壁网络是在PT完成前后形成的,畴壁网络的寿命很大程度上取决于真真空的简并性是否被打破.我们的数值计算结果表明,畴壁网络继续产生GW的PTs后,导致显着改变的频谱形状和提高幅度约一个订单。产生的GW功率谱在$kR_* \simeq π$处达到峰值,在峰值波数以上,它具有接近$k^{-1.2}$的衰减幂律,随后是UV截止在$kR_* \sim \mathcal{O}(10^2)$处的缓慢降低的平台

英文摘要:

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 $kR_* \sim \mathcal{O}(10^2)$

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