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arXiv 2102.00028astro-ph.CO
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来自CMB E模式数据的高$H_0$值:解决哈勃张力的线索?

High $H_0$ Values from CMB E-mode Data: A Clue for Resolving the Hubble Tension?

Graeme E. Addison

摘要:

由普朗克、ACTPol和SPTPol测量的E模式(EE)CMB功率谱将哈勃常数约束为标准$Λ$ CDM模型(后验均值和中心68%区间界限)内的$70.0\pm2.7$、$72.4^{+3.9}_{-4.8}$和$73.1^{+3.3}_{-3.9}$ km s $^{-1}$ Mpc $^{-1}$。这些值高于普朗克温度(TT)功率谱的限制,并与造父变星超新星距离阶梯测量$H_0=73.2\pm1.3$ km s $^{-1}$ Mpc $^{-1}$一致。如果这种对更高值的偏好在联合分析中得到加强,它可能会为哈勃分歧的解决提供一个有趣的暗示。然而,我们发现,结合普朗克,ACTPol,和SPTPol EE的可能性产生$H_0=68.7\pm1.3$ km s $^{-1}$ Mpc $^{-1}$,$2.4σ$低于距离阶梯测量。这是由于不同的简并方向在整个参数空间,特别是涉及重子密度,$Ω_bh^2$,和标量倾斜,$n_s$,所产生的灵敏度不同的多极范围。我们表明,E-模式$Λ$ CDM约束是一致的,在$1.4σ$内的不同实验,并与普朗克TT结果在$0.8σ$。结合普朗克,ACTPol,和SPTPol EE数据约束的现象学透镜振幅,$A_L=0.89\pm0.10$,与预期值一致的单位。

英文摘要:

The E-mode (EE) CMB power spectra measured by Planck, ACTPol, and SPTpol constrain the Hubble constant to be $70.0\pm2.7$, $72.4^{+3.9}_{-4.8}$, and $73.1^{+3.3}_{-3.9}$ km s$^{-1}$ Mpc$^{-1}$ within the standard $Λ$CDM model (posterior mean and central 68% interval bounds). These values are higher than the constraints from the Planck temperature (TT) power spectrum, and consistent with the Cepheid-supernova distance ladder measurement $H_0=73.2\pm1.3$ km s$^{-1}$ Mpc$^{-1}$. If this preference for a higher value was strengthened in a joint analysis it could provide an intriguing hint at the resolution of the Hubble disagreement. We show, however, that combining the Planck, ACTPol, and SPTpol EE likelihoods yields $H_0=68.7\pm1.3$ km s$^{-1}$ Mpc$^{-1}$, $2.4σ$ lower than the distance ladder measurement. This is due to different degeneracy directions across the full parameter space, particularly involving the baryon density, $Ω_bh^2$, and scalar tilt, $n_s$, arising from sensitivity to different multipole ranges. We show that the E-mode $Λ$CDM constraints are consistent across the different experiments within $1.4σ$, and with the Planck TT results at $0.8σ$. Combining the Planck, ACTPol, and SPTpol EE data constrains the phenomenological lensing amplitude, $A_L=0.89\pm0.10$, consistent with the expected value of unity.

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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