Multiple fields can become dynamical during the inflationary epoch. We consider an example where a light field acquires isocurvature fluctuations during inflation and contributes to the dark matter abundance at late times. Interactions between the light field and the adiabatic sector contribute to mixed adiabatic-isocurvature non-Gaussianity (NG). We show the resulting form of NG has a different kinematic dependence than the `local shape' commonly considered, and highlight the parameter space where a dedicated search is expected to significantly improve the current Planck sensitivity. We interpret our results in the context of the QCD axion and illustrate how the proposed NG searches can improve upon the existing searches for isocurvature power spectrum and bispectrum.

中文翻译：

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探测具有原始非高斯性的暗物质等曲率


在通货膨胀时期，多个领域可能会变得动态。我们考虑一个例子，其中光场在膨胀过程中获得等曲率波动，并在后期导致暗物质丰度。光场和绝热扇区之间的相互作用有助于混合绝热-等曲率非高斯分布 （NG）。我们展示了 NG 的结果形式与通常认为的“局部形状”具有不同的运动学依赖性，并强调了参数空间，在该参数空间中，专用搜索有望显着提高当前的普朗克灵敏度。我们在 QCD 轴子的背景下解释我们的结果，并说明了所提出的 NG 搜索如何改进现有的等曲功率谱和双谱搜索。