Atacama Cosmology Telescope: Constraints on prerecombination early dark energy
Atacama Cosmology Telescope: Constraints on prerecombination early dark energy
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阿塔卡马宇宙学望远镜：预重组早期暗能量的限制
DOI：
10.1103/physrevd.105.123536
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发表时间：
2022
影响因子：
5
通讯作者：
Ferraro, Simone
中科院分区：
文献类型：
--
作者：
Hill, J. Colin;Calabrese, Erminia;Aiola, Simone;Battaglia, Nicholas;Bolliet, Boris;Choi, Steve K.;Devlin, Mark J.;Duivenvoorden, Adriaan J.;Dunkley, Jo;Ferraro, Simone
早期暗能量（EDE）方案旨在通过在早期宇宙中引入一种新形式的能量密度来增加从宇宙微波背景（CMB）数据推断的哈勃常数（）的值，而不是标准宇宙学模型（）中发现的值。EDE成分在重组之前短暂地加速了宇宙膨胀，这减小了CMB中声音视界的物理尺寸。以前的工作已经发现，非零EDE是不喜欢由普朗克CMB功率谱数据单独，产生95%的置信水平（C.L.）上限的最大分数贡献的EDE领域的宇宙能量收支。在本文中，我们适合的EDE模型的CMB数据从阿塔卡玛宇宙望远镜（ACT）的数据发布4。我们发现ACT、大尺度PlanckTT（类似于WMAP）、PlanckCMB透镜和BAO数据的组合更倾向于在：，（两者都是68% C.L.）存在EDE。从模型选择的角度来看，我们发现，EDE的青睐超过这些数据在roughly显着。与此相反，一个完整的普朗克和ACT数据的联合分析没有产生EDE的证据，如以前发现的普朗克单独。我们发现，在ACT单独的偏好是由其TE和EE功率谱数据驱动的EDE。Planckalone对EDE的严格约束是由其高功率谱数据驱动的。了解这些不同的限制是物理性质的，由于系统学，或只是一个罕见的统计波动是高度优先事项。ACT和Planck的最佳拟合EDE模型在TE和EE的多极范围内表现出一致的差异，这表明可以利用ACT和其他地基实验的近期数据对这种情况进行强有力的测试。
The early dark energy (EDE) scenario aims to increase the value of the Hubble constant () inferred from cosmic microwave background (CMB) data over that found in the standard cosmological model (), via the introduction of a new form of energy density in the early Universe. The EDE component briefly accelerates cosmic expansion just prior to recombination, which reduces the physical size of the sound horizon imprinted in the CMB. Previous work has found that nonzero EDE is not preferred byPlanckCMB power spectrum data alone, which yield a 95% confidence level (C.L.) upper limiton the maximal fractional contribution of the EDE field to the cosmic energy budget. In this paper, we fit the EDE model to CMB data from the Atacama Cosmology Telescope (ACT) data release 4. We find that a combination of ACT, large-scalePlanckTT (similar toWMAP),PlanckCMB lensing, and BAO data prefers the existence of EDE at:, with(both 68% C.L.). From a model-selection standpoint, we find that EDE is favored overby these data at roughlysignificance. In contrast, a joint analysis of the fullPlanckand ACT data yields no evidence for EDE, as previously found forPlanckalone. We show that the preference for EDE in ACT alone is driven by its TE and EE power spectrum data. The tight constraint on EDE fromPlanckalone is driven by its high-power spectrum data. Understanding whether these differing constraints are physical in nature, due to systematics, or simply a rare statistical fluctuation is of high priority. The best-fit EDE models to ACT andPlanckexhibit coherent differences across a wide range of multipoles in TE and EE, indicating that a powerful test of this scenario is anticipated with near-future data from ACT and other ground-based experiments.
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透镜 CMB 功率谱对基础物理的重子反馈偏差
影响因子：
5
作者：
Fiona McCarthy;J. Hill;M. Madhavacheril
通讯作者：
M. Madhavacheril
DOI：
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发表时间：
1978-06
期刊：
--
影响因子：
--
作者：
C. Woo
通讯作者：
C. Woo
DOI：
--
发表时间：
2011-04
期刊：
arXiv: Instrumentation and Methods for Astrophysics
影响因子：
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作者：
J. Lesgourgues
通讯作者：
J. Lesgourgues
影响因子：
8.6
作者：
I. Zlatev;Limin Wang;Paul J. Steinhardt University of Pennsylvania;P. University
通讯作者：
I. Zlatev;Limin Wang;Paul J. Steinhardt University of Pennsylvania;P. University
DOI：
--
发表时间：
2020-08
期刊：
arXiv: Cosmology and Nongalactic Astrophysics
影响因子：
--
作者：
S. Alam;M. Aubert;S. Ávila;C. Balland;J. Bautista;M. Bershady;D. Bizyaev;M. Blanton;A. Bolton-A.
通讯作者：
S. Alam;M. Aubert;S. Ávila;C. Balland;J. Bautista;M. Bershady;D. Bizyaev;M. Blanton;A. Bolton-A.