论文标题
域墙网络的稳定性具有初始通货膨胀波动及其对宇宙双折射的影响
Stability of domain wall network with initial inflationary fluctuations, and its implications for cosmic birefringence
论文作者
论文摘要
我们通过数值晶格计算研究了域壁的形成和演变，这些晶格计算首次正确考虑了超级方尺度上的相关性。我们发现，与广泛持有的主张相反，{在过去的几十年中}，即使初始分布在很大程度上偏向一个最小值时，域壁网络也表现出显着的稳定性。这是由于以下事实：域墙网络保留了有关超轨道尺度初始条件的信息，并且从这个意义上讲，缩放解决方案不是本地吸引子。我们的发现立即暗示，此类域壁将对宇宙学产生重大影响，包括引力波的产生，重生生成和来自域壁的暗物质。将此结果应用于轴突状的颗粒域壁，我们表明，它不仅解释了最近分析所暗示的各向异性宇宙双折射，而且还预测了各向异性宇宙双重双歧透过，它几乎在大尺度上是尺度上几乎是规模不变的，并且可以通过未来的CMB观察来探测。
We study the formation and evolution of domain walls with initial inflationary fluctuations by numerical lattice calculations that, for the first time, correctly take into account correlations on superhorizon scales. We find that, contrary to the widely-held claim {over the past few tens of years}, the domain wall network exhibits remarkable stability even when the initial distribution is largely biased toward one of the minima. This is due to the fact that the domain wall network retains information about initial conditions on superhorizon scales, and that the scaling solution is not a local attractor in this sense. Our finding immediately implies that such domain walls will have a significant impact on cosmology, including the production of gravitational waves, baryogenesis, and dark matter from domain walls. Applying this result to the axion-like particle domain wall, we show that it not only explains the isotropic cosmic birefringence suggested by the recent analysis, but also predicts anisotropic cosmic birefringence that is nearly scale-invariant on large scales and can be probed by future CMB observations.
