论文标题
典型的宇宙学紧张局势
Quintessential Cosmological Tensions
论文作者
论文摘要
根据最近的数据，出现了几种宇宙学紧张局势，最著名的是参数的推断$ h_0 $和$σ_8$。我们探讨了通过Albrecht-Skordis``Quintessence''潜力来减轻这两种紧张局势的可能性。该领域可以减少声音范围$ r_s^*$的大小，同时在当今的能量密度预算占主导地位之前，同时抑制物质密度波动的功率。有趣的是，这套丰富的动态集完全由一个自由参数（$ \ Mathcal {o}（10）$中的一个免费参数支配。我们发现，与$λ$ cdm案例相比，$ H_0 $的推断价值可以增加，而$σ_8$的值可以减少约1σ$。但是，与标准的$λ$ CDM模型相比，仅普朗克和BAO数据最终就会不利于该模型，$Δχ^2 \约为 +6 $。当包括大型结构和超新星数据$Δχ^2 \大约 +1 $时。我们注意到，历史上，很多关注都集中在保留三个角度尺度$θ_d$，$θ_{eq} $和$θ_s^*$上的$λ$ CDM值。我们的作品举例说明了如何使CMB数据相对拟合的超相对论物种的数量相对较好，但它在更一般的模型空间中保持这种拟合度不足。
Several cosmological tensions have emerged in light of recent data, most notably in the inferences of the parameters $H_0$ and $σ_8$. We explore the possibility of alleviating both these tensions {\it simultaneously} by means of the Albrecht-Skordis ``quintessence'' potential. The field can reduce the size of the sound horizon $r_s^*$ while concurrently suppressing the power in matter density fluctuations before it comes to dominate the energy density budget today. Interestingly, this rich set of dynamics is governed entirely by one free parameter that is of $\mathcal{O}(10)$ in Planck units. We find that the inferred value of $H_0$ can be increased, while that of $σ_8$ can be decreased, both by $\approx 1σ$ compared to the $Λ$CDM case. However, ultimately the model is disfavored by Planck and BAO data alone, compared to the standard $Λ$CDM model, with a $Δχ^2 \approx +6$. When including large scale structure and supernova data $Δχ^2 \approx +1$. We note that historically much attention has been focused on preserving the three angular scales $θ_D$, $θ_{EQ}$, and $θ_s^*$ to their $Λ$CDM values. Our work presents an example of how, while doing so indeed maintains a relatively good fit to the CMB data for an increased number of ultra-relativistic species, it is a-priori insufficient in maintaining such a fit in more general model spaces.
