论文标题
纳米-Hz引力波来自轴线暗物质
Nano-Hz gravitational wave signature from axion dark matter
论文作者
论文摘要
我们计算了由轴线暗物质产生的u（1）量规场的随机重力波背景的准确光谱。量规场的爆炸性生产很快使线性分析的适用性无效，并且需要非线性方案。我们利用数值晶格模拟正确遵循非线性动力学，例如逆向和撤退，这对引力波排放有重要贡献。事实证明，具有衰减常数$ f \ sim 10^{16} $ gev的轴轴，它给出了正确的暗物质丰度，可预测SKA可检测到的圆形极化引力波。我们还表明，由此产生的重力波谱有可能解释纳米格拉夫12。5年的数据。
We calculate the accurate spectrum of the stochastic gravitational wave background from U(1) gauge fields produced by axion dark matter. The explosive production of gauge fields soon invalidates the applicability of the linear analysis and one needs nonlinear schemes. We make use of numerical lattice simulations to properly follow the nonlinear dynamics such as backreaction and rescattering which gives important contributions to the emission of gravitational waves. It turns out that the axion with the decay constant $f \sim 10^{16}$ GeV which gives the correct dark matter abundance predicts the circularly polarized gravitational wave signature detectable by SKA. We also show that the resulting gravitational wave spectrum has a potential to explain NANOGrav 12.5 year data.
