论文标题
了解大规模的CMB异常在通货膨胀期间具有广义的非最小衍生耦合
Understanding large scale CMB anomalies with the generalized non-minimal derivative coupling during inflation
论文作者
论文摘要
我们研究了一类通货膨胀模型的观察意义，其中充气通过通用的非微导数耦合（GNMDC）耦合到爱因斯坦张量。特别是，我们探讨了这些模型是否可以在曲率扰动的原始光谱中产生合适的特征，以此作为与CMB温度各向异性角度功率相关的大规模异常的解释。考虑到标量和张量的扰动，我们在这种情况下对GNMDC函数的模型无关的约束。我们修改COSMOMC以适应我们的GNMDC框架，并使用完全一致的数值方法研究不同类别的通货膨胀模型。我们发现，具有特定选择的GNMDC函数的山顶四分之一模型可为最佳拟合参考$λ$ CDM模型具有相当大的改进，并具有几乎规模不变的功率谱。尽管大规模的结构观测值应该能够提供独立的约束，但未来的CMB实验（例如CMB-S4和CMB-BHARAT）有望进一步限制超出规范单场通货膨胀模型之外的参数空间。
We study the observational implications of a class of inflationary models wherein the inflaton is coupled to the Einstein tensor through a generalized non-minimal derivative coupling (GNMDC). In particular, we explore whether these models can generate suitable features in the primordial spectrum of curvature perturbations as a possible explanation for the large-scale anomalies associated with the angular power spectrum of CMB temperature anisotropies. We derive model-independent constraints on the GNMDC function for such a scenario, considering both the scalar and tensor perturbations. We modify CosmoMC to accommodate our GNMDC framework and investigate different classes of inflationary models using a fully consistent numerical approach. We find that the hilltop-quartic model with a specific choice of the GNMDC function provides a considerable improvement over the best-fit reference $Λ$CDM model with a nearly scale-invariant power spectrum. While the large-scale structure observations should be able to provide independent constraints, future CMB experiments, such as CMB-S4 and CMB-Bharat, are expected to constrain further the parameter space of such beyond canonical single-field inflationary models.
