论文标题
混合宇宙吸引子
Hybrid cosmological attractors
论文作者
论文摘要
我们构建了$α$ - 吸收器版本的混合通货膨胀模型。在这些型号中，第二场$χ$的潜力使Eftraton Field $φ$的潜力提升。这种令人振奋的结束是由于速率不稳定相对于字段$χ$，当$φ$变得小于某些临界值$φ_{c} $时，它就会出现。在大$ n $限制中，这些型号具有标准的通用$α$吸引者预测。特别是，对于指数吸引子，$ n_ {s} = 1- {2 \ aver n} $。但是，在某些特殊情况下，大$ n $限制仅在$ n \ gtrsim 60 $的情况下才达到地平线。这可能会改变宇宙学观察的预测。对于任何固定的$ n $，在大型上升$ v _ {\ rm up} $的限制中，或在大$φ_{c} $的限制中，我们找到了另一个吸引者预测，$ n_s = 1 $。通过更改参数$ v _ {\ rm up} $和$φ__{c} $一个人可以在两个吸引子预测$ n_ {s} = 1- {2 \ over n} $和$ n_ {s} = 1 $之间连续插值。这提供了明显的灵活性，鉴于宇宙学数据的迅速增长和精度，这一点非常欢迎。我们的主要结果并非特定于混合膨胀模型。相反，由于某些原因出于某些原因，通货膨胀潜力被提升并且通货膨胀过早结束的任何通货膨胀模型都是通用的。
We construct $α$-attractor versions of hybrid inflation models. In these models, the potential of the inflaton field $φ$ is uplifted by the potential of the second field $χ$. This uplifting ends due to a tachyonic instability with respect to the field $χ$, which appears when $φ$ becomes smaller than some critical value $φ_{c}$. In the large $N$ limit, these models have the standard universal $α$-attractor predictions. In particular, $n_{s }= 1- {2 \over N}$ for the exponential attractors. However, in some special cases the large $N$ limit is reached only beyond the horizon, for $N \gtrsim 60$. This may change predictions for the cosmological observations. For any fixed $N$, in the limit of large uplift $V_{\rm up}$, or in the limit of large $φ_{c}$, we find another attractor prediction, $ n_s = 1$. By changing the parameters $V_{\rm up}$ and $φ_{c}$ one can continuously interpolate between the two attractor predictions $n_{s }= 1- {2 \over N}$ and $n_{s} = 1$. This provides significant flexibility, which can be very welcome in view of the rapidly growing amount and precision of the cosmological data. Our main result is not specific to the hybrid inflation models. Rather, it is generic to any inflationary models where the inflaton potential, for some reasons, is uplifted, and inflation ends prematurely.
