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arXiv 1910.09565astro-ph.COastro-ph.GA
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重子对CMB透镜效应和中微子质量约束的影响

Baryonic effects on CMB lensing and neutrino mass constraints

Eegene Chung, Simon Foreman, Alexander van Engelen

摘要:

对宇宙微波背景(CMB)引力透镜效应的测量有望在高红移下获得对宇宙学的独特见解。由于与星系形成和演化相关的重子效应,包括气体冷却、恒星形成以及来自活动星系核(AGN)和超新星的反馈,在预测未来CMB巡天的灵敏度时通常被忽略。在本文中,我们确定这些影响使用四套流体动力学模拟,其中包括各种处方重子过程,即OWLS,BAHAMAS,地平线,和IllustrisTNG。我们的分析表明,由于重子效应,在实验可观察到的角尺度下,与仅模拟暗物质相比,CMB透镜的特征功率为百分之几。我们研究了相关的偏见,如即将到来的西蒙斯天文台和CMB-S4的实验推断中微子质量。根据实验精度和模拟中重子反馈的强度,中微子质量和的偏差显示出显著的分散性,范围从非常小到高估1.1 $σ$。我们的结论是重子效应将可能是不可忽略的中微子质量的检测使用CMB透镜。

英文摘要:

Measurements of gravitational lensing of the cosmic microwave background (CMB) hold the promise of yielding unique insights into cosmology at high redshift. Uncertainties due to baryonic effects associated with galaxy formation and evolution, including gas cooling, star formation, and feedback from active galactic nuclei (AGN) and supernovae, have typically been neglected when forecasting the sensitivity of future CMB surveys. In this paper, we determine the impact of these effects using four suites of hydrodynamical simulations which incorporate various prescriptions for baryonic processes, namely OWLS, BAHAMAS, Horizon, and IllustrisTNG. Our analysis shows characteristic power suppressions of several percent in CMB lensing due to baryonic effects, compared to dark-matter only simulations, at experimentally observable angular scales. We investigate the associated bias in the inferred neutrino mass for experiments like the upcoming Simons Observatory and CMB-S4. Depending on the experimental precision and the strength of the baryonic feedback within the simulations, biases in the neutrino mass sum show significant dispersion, ranging from very small to an over-estimation by 1.1$σ$. We conclude that baryonic effects will likely be non-negligible for a detection of neutrino mass using CMB lensing.

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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