论文标题
警示性故事：单场，慢速通货膨胀模型中的暗能量
A Cautionary Tale: Dark Energy in Single-Field, Slow-Roll Inflationary Models
论文作者
论文摘要
当前的加速宇宙膨胀时期被认为是由暗能量驱动的，在标准模型中，宇宙学常数的形式具有状态参数方程式$ W = -1 $。我们通过与通货膨胀相似，提出了对黑暗能量本质的创新视角，我们假设这是由单个标量场驱动的。充气不是一个宇宙常数，这表明通货膨胀结束，而普朗克卫星的约束$ n_s \ neq 1 $以$8σ$置信度。因此，有趣的是验证其状态参数方程是否与$ -1 $有可能不同。我们为一类单场慢速通货膨胀模型分析了这个问题，其中哈勃慢速参数的层次结构以不同的顺序截断。基于最新的Planck和Bicep2/Keck数据，我们获得了$ 68 \％$ $上限的三参数型号的$ 1+W <0.0014 $，这为数据提供了最佳描述。这提供了一个警示性的故事，以根据与当前和即将进行的宇宙学调查的偏离偏离偏离的偏差，得出有关当今黑暗能量的性质的结论。
The current epoch of accelerated cosmic expansion is postulated to be driven by dark energy, which in the standard model takes the form of a cosmological constant with equation of state parameter $w=-1$. We propose an innovative perspective over the nature of dark energy by drawing a parallel with inflation, which we assume to be driven by a single scalar field, the inflaton. The inflaton was not a cosmological constant, as indicated by the fact that inflation ended and by the Planck satellite's constraint of $n_s\neq 1$ at $8σ$ confidence. Therefore, it is interesting to verify whether its equation of state parameter was measurably different from $-1$. We analyze this question for a class of single-field slow-roll inflationary models, where the hierarchy of Hubble slow-roll parameters is truncated at different orders. Based on the latest Planck and BICEP2/Keck data, we obtain a $68\%$ upper bound of $1+w < 0.0014$ for the three-parameter model, which gives the best description to the data. This provides a cautionary tale for drawing conclusions about the nature of today's dark energy based upon the non-detection of a deviation from $w=-1$ with current and upcoming cosmological surveys.
