论文标题
国际脉冲星的新颖物理学阵列：轴突状的颗粒，域墙和宇宙字符串
Novel Physics with International Pulsar Timing Array: Axionlike Particles, Domain Walls and Cosmic Strings
论文作者
论文摘要
在Nanograv之后，IPTA协作还报告了随机引力波背景的有力证据。这个提示对基本物理具有非常重要的含义。随着最近的IPTA数据版本第二，我们尝试搜索轻型新物理学的信号。并对可听见的轴，域壁和宇宙字符串模型给出新的约束。我们发现，对应于衰减常数$ f \ oft times10^{17} $ gev和轴质量$ m_a \ oft2 \ times10^{ - 13} $ ev的最佳拟合点，由IPTA排除在$2σ$ pustrust Level。固定耦合强度$λ= 1 $，我们获得了$2σ$的下限$ z_2 $对称$η> 135 $ tev。有趣的是，我们对宇宙弦张力$ \ mathrm {log} _ {10} \，gμ= -8.93 _ { - 0.06}^{+0.12} $在$1σ$置信度等级。采用贝叶斯因子的规则，我们发现IPTA数据分别比可听见的轴，域，域壁和宇宙字符串的不相关的公共幂律（CPL）模型具有中等，强和不确定的偏好。这意味着，很难将CPL与当前观测值的宇宙字符串区分开，并且需要更高精度的PULSAR计时数据来提供基本物理的新线索。
After NANOGrav, the IPTA collaboration also reports a strong evidence of a stochastic gravitation wave background. This hint has very important implications for fundamental physics. With the recent IPTA data release two, we attempt to search signals of light new physics. and give new constraints on the audible axion, domain walls and cosmic strings models. We find that the best fit point corresponding to a decay constant $F\approx5\times10^{17}$ GeV and an axion mass $m_a\approx2\times10^{-13}$ eV from NANOGrav data is ruled out by IPTA at beyond $2σ$ confidence level. Fixing the coupling strength $λ=1$, we obtain a $2σ$ lower bound on the breaking scale of $Z_2$ symmetry $η>135$ TeV. Interestingly, we give a very strong restriction on the cosmic-string tension $\mathrm{log}_{10}\,Gμ=-8.93_{-0.06}^{+0.12}$ at $1σ$ confidence level. Employing the rule of Bayes factor, we find that IPTA data has a moderate, strong and inconclusive preference of an uncorrelated common power-law (CPL) model over audible axion, domain walls and cosmic strings, respectively. This means that it is hard to distinguish CPL from cosmic strings with current observations and more pulsar timing data with high precision are required to give new clues of underlying physics.
