论文标题
在两个田间通货膨胀模型中在大尺度上产生原始特征
Generating primordial features at large scales in two field models of inflation
论文作者
论文摘要
当通货膨胀由两个标量场驱动时，我们研究原始功率谱（PPS）中大尺度的特征的产生。在通货膨胀的规范单场模型中，这些特征通常是由于与慢速滚动机制的偏差而产生的。尽管由于田间空间中的轨迹急剧转弯，在两个场模型中自然可以实现与慢滚的偏差，但在涉及两个规范标量场的模型中，CMB温度各向异性所建议的类型的最大尺度的特征更难以实现。相反，我们表明标量字段的动力学项之间的耦合可以很容易地产生此类功能。我们讨论了其理论预测与当前观察结果一致的模型，并突出了我们结果的含义。
We investigate the generation of features at large scales in the primordial power spectrum (PPS) when inflation is driven by two scalar fields. In canonical single field models of inflation, these features are often generated due to deviations from the slow-roll regime. While deviations from slow-roll can be naturally achieved in two field models due to a sharp turn in the trajectory in the field space, features at the largest scales of the types suggested by CMB temperature anisotropies are more difficult to achieve in models involving two canonical scalar fields due to the presence of isocurvature fluctuations. We show instead that a coupling between the kinetic terms of the scalar fields can easily produce such features. We discuss models whose theoretical predictions are consistent with current observations and highlight the implications of our results.
