论文标题
从$ planck $和二头肌/凯克数据集的通货膨胀期间，对轴测仪现场动态的新限制
New constraints on axion-gauge field dynamics during inflation from $Planck$ and BICEP/Keck data sets
论文作者
论文摘要
我们在通货膨胀期间使用最新的$ Planck $（PR4）和BICEP/KECK 2018数据发行在通货膨胀期间提出了对观众轴的新约束-U $ {\ rm U}（1）$ gauge字段交互。该模型可以从扩增的量规场波动中采取张量的扰动，这是由轴支滚动在通货膨胀期间的几个e折中驱动的。以这种方式采购的引力波具有强大的尺度依赖性（和手性）的频谱，对CMB的大/中级尺度$ b $ modes有潜在可见的贡献。我们首先在模型上得出理论界限，该模型在背景动力学上施加了扰动状态的有效性和量规场的反应可忽略不计。然后，我们从当前的CMB观察结果中确定界限，采用频繁的轮廓可能性方法。我们研究了模型参数典型选择的约束行为，分析了不同数据集组合的影响。我们发现观察界与理论界限具有竞争力，它们共同排除了模型参数空间的很大一部分。我们认为，对于针对大型/中级尺度$ b $ modes的未来CMB实验，参数空间仍然很大且有趣。
We present new constraints on spectator axion-${\rm U}(1)$ gauge field interactions during inflation using the latest $Planck$ (PR4) and BICEP/Keck 2018 data releases. This model can source tensor perturbations from amplified gauge field fluctuations, driven by an axion rolling for a few e-folds during inflation. The gravitational waves sourced in this way have a strongly scale-dependent (and chiral) spectrum, with potentially visible contributions to large/intermediate scale $B$-modes of the CMB. We first derive theoretical bounds on the model imposing validity of the perturbative regime and negligible backreaction of the gauge field on the background dynamics. Then, we determine bounds from current CMB observations, adopting a frequentist profile likelihood approach. We study the behaviour of constraints for typical choices of the model's parameters, analyzing the impact of different dataset combinations. We find that observational bounds are competitive with theoretical ones and together they exclude a significant portion of the model's parameter space. We argue that the parameter space still remains large and interesting for future CMB experiments targeting large/intermediate scales $B$-modes.
