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arXiv 2202.09379astro-ph.COhep-ph
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普朗克、SPT和ACT数据中早期暗能量的暗示:新物理学还是系统学?

Hints of Early Dark Energy in Planck, SPT, and ACT data: new physics or systematics?

Tristan L. Smith, Matteo Lucca, Vivian Poulin, Guillermo F. Abellan, Lennart Balkenhol, Karim Benabed, Silvia Galli, Riccardo Murgia

摘要:

我们使用ACT DR 4、SPT-3G 2018、普朗克极化和受限普朗克温度数据(在$\ell<650$)研究了早期暗能量(EDE)的约束,发现EDE优于$Λ$ CDM的$3.3σ$偏好($Δχ^2=-16.2$额外3个自由度)。EDE在红移$z_c=3357\pm200$处贡献了最大分数能量密度$f_{\rm EDE}(z_c)=0.163^{+0.047}_{-0.04}$,并导致CMB推断的哈勃常数$H_0=74.2^{+1.9}_{-2.1}$ km/s/Mpc的值。我们发现,普朗克和ACT DR 4数据提供了$χ^2$的大部分改进,并且包含SPT-3G将$f_{\rm EDE}(z_c)$的后部拉离$Λ$ CDM。这是第一次,一个中等偏好的EDE已报告这三个组合CMB数据集。我们发现,包括测量超新星光度的距离和重子声振荡标准尺的影响最小的偏好($3.0σ$),而测量探测的集群的物质在晚些时候-从普朗克和$f σ_8$从BOSS的透镜势功率谱-减少的意义的偏好2.6 $σ$。相反,在SH 0 ES协作报告的$H_0$值上添加先验会增加对$4-5σ$水平的偏好。在没有这种先验的情况下,在$\ell>1300$中包含普朗克TT数据减少了从$3.0σ$到$2.3σ$的偏好,并且对$f_{\rm EDE}(z_c)$的约束变得与$1σ$中的$Λ$ CDM兼容。我们探讨了普朗克偏振数据中的系统误差是否会影响我们的结论,并发现改变TE偏振效率会显着降低普朗克对EDE的偏好。需要做更多的工作来确定这些仅在CMB数据中的EDE提示是系统误差的唯一结果还是新物理学的开放。

英文摘要:

We investigate constraints on early dark energy (EDE) using ACT DR4, SPT-3G 2018, Planck polarization, and restricted Planck temperature data (at $\ell<650$), finding a $3.3σ$ preference ($Δχ^2=-16.2$ for 3 additional degrees of freedom) for EDE over $Λ$CDM. The EDE contributes a maximum fractional energy density of $f_{\rm EDE}(z_c)=0.163^{+0.047}_{-0.04}$ at a redshift $z_c=3357\pm200$ and leads to a CMB inferred value of the Hubble constant $H_0=74.2^{+1.9}_{-2.1}$ km/s/Mpc. We find that Planck and ACT DR4 data provide the majority of the improvement in $χ^2$, and that the inclusion of SPT-3G pulls the posterior of $f_{\rm EDE}(z_c)$ away from $Λ$CDM. This is the first time that a moderate preference for EDE has been reported for these three combined CMB data sets. We find that including measurements of supernovae luminosity distances and the baryon acoustic oscillation standard ruler only minimally affects the preference ($3.0σ$), while measurements that probe the clustering of matter at late times - the lensing potential power spectrum from Planck and $f σ_8$ from BOSS - decrease the significance of the preference to 2.6$σ$. Conversely, adding a prior on the $H_0$ value as reported by the SH0ES collaboration increases the preference to the $4-5σ$ level. In the absence of this prior, the inclusion of Planck TT data at $\ell>1300$ reduces the preference from $3.0σ$ to $2.3σ$ and the constraint on $f_{\rm EDE}(z_c)$ becomes compatible with $Λ$CDM at $1σ$. We explore whether systematic errors in the Planck polarization data may affect our conclusions and find that changing the TE polarization efficiencies significantly reduces the Planck preference for EDE. More work will be necessary to establish whether these hints for EDE within CMB data alone are the sole results of systematic errors or an opening to new physics.

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