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arXiv 2505.08051astro-ph.COhep-ph
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ACT DR6 和 DESI DR2 对早期暗能量及哈勃张力的影响

Impact of ACT DR6 and DESI DR2 for Early Dark Energy and the Hubble tension

Vivian Poulin, Tristan L. Smith, Rodrigo Calderón, Théo Simon

AI总结:

基于ACT DR6和DESI DR2数据更新EDE模型约束,发现其仍可缓解哈勃张力,与SH0ES残余张力降至约2σ,且H0=73的EDE模型优于ΛCDM。

摘要:

阿塔卡马宇宙学望远镜第六次数据发布(ACT DR6)和暗能量光谱仪器第二次数据发布(DESI DR2)近期已公开。基于这些数据,我们更新了早期暗能量(EDE)对哈勃张力问题的解决约束。尽管ACT DR6并不比核心宇宙学模型ΛCDM更偏好EDE,但相比最新分析的Planck NPIPE数据,它在小角尺度精度提高的情况下,允许EDE在再复合时期之前的最大贡献f_EDE显著更大。此外,EDE提高了H0rs的值,改善了CMB与DESI DR2数据之间的一致性。我们发现,对于Planck(ℓ<1000)+ ACT DR6 + 透镜 + Pantheon-plus + DESI DR2的组合,与SH0ES的残余张力约为2σ,相比使用NPIPE和SDSS BAO数据的分析中的3.7σ显著降低。轮廓似然分析揭示了在未包含SH0ES的贝叶斯分析中存在显著的先验体积效应,置信区间为f_EDE=0.09±0.03和H0=71.0±1.1 km/s/Mpc。当包含DESI数据时,H0=73 km/s/Mpc的EDE模型比H0=68.4 km/s/Mpc的ΛCDM模型提供了更好的拟合。包含SH0ES数据将偏好提升至远高于5σ,Δχ²=-35.4。我们的工作表明,在ACT DR6和DESI DR2之后,EDE仍然是哈勃张力问题的潜在解决方案。

英文摘要:

The data release six of the Atacama Cosmology Telescope (ACT DR6) and the second data release from the Dark Energy Spectroscopic Instrument (DESI DR2) recently became available. In light of these data, we update constraints on the Early Dark Energy (EDE) resolution to the Hubble tension. While ACT DR6 does not favor EDE over the core cosmological model $Λ$CDM, it allows for a significantly larger maximum contribution of EDE, $f_{\rm EDE}$, in the pre-recombination era than the latest analysis of {\it Planck} NPIPE despite increased precision at small angular scales. Moreover, EDE rises the value of $H_0r_s$, improving consistency between CMB and DESI DR2 data. We find a residual tension with SH0ES of $\sim 2 σ$ for the combination of {\it Planck} at $\ell <1000$ + ACT DR6 + lensing + Pantheon-plus + DESI DR2, a significant decrease from $3.7 σ$ for analyses that use NPIPE and SDSS BAO data. A profile likelihood analysis reveals significant prior-volume effects in Bayesian analyses which do not include SH$0$ES, with confidence intervals of $f_{\rm EDE}=0.09\pm 0.03$ and $H_0= 71.0\pm1.1$ km/s/Mpc. When including DESI data, the EDE model with $H_0=73$ km/s/Mpc provides a better fit than the $Λ$CDM model with $H_0=68.4$ km/s/Mpc. The inclusion of SH$0$ES data rises the preference well above $5σ$, with $Δχ^2=-35.4$. Our work demonstrates that after ACT DR6 and DESI DR2, EDE remains a potential resolution to the Hubble tension.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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