论文标题
黑暗面的耳语：与纳米格拉夫数据面对新物理
Whispers from the dark side: Confronting light new physics with NANOGrav data
论文作者
论文摘要
Nanograv协作最近观察到了PULSAR时序数据中引力波背景（GWB）的第一个证据。在这里，我们探讨了该GWB是由于新物理学引起的，并表明信号也可以像峰值光谱一样吻合，例如相变（PTS）或早期宇宙中的轴颗粒（ALP）的动力学的峰值光谱。我们发现，在1 MEV至10 MEV的温度下，可以获得非常强的PT的数据。对于ALP的说明，对于$ f \ 5 \ times 10^{17} $ gev和$ 2 \ times 10^{ - 13} $ ev的轴质量的衰减常数可获得最佳拟合。我们还说明了PTA限制这些模型参数空间的能力，并获得已经与其他宇宙学界限相当的限制。
The NANOGrav collaboration has recently observed first evidence of a gravitational wave background (GWB) in pulsar timing data. Here we explore the possibility that this GWB is due to new physics, and show that the signal can be well fit also with peaked spectra like the ones expected from phase transitions (PTs) or from the dynamics of axion like particles (ALPs) in the early universe. We find that a good fit to the data is obtained for a very strong PT at temperatures around 1 MeV to 10 MeV. For the ALP explanation the best fit is obtained for a decay constant of $F \approx 5\times 10^{17}$ GeV and an axion mass of $2\times 10^{-13}$ eV. We also illustrate the ability of PTAs to constrain the parameter space of these models, and obtain limits which are already comparable to other cosmological bounds.
