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arXiv 0902.1494astro-ph.CO
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CMB透镜和弱透镜层析成像对早期暗能量的约束

Constraints on early dark energy from CMB lensing and weak lensing tomography

Lukas Hollenstein, Domenico Sapone, Robert Crittenden, Bjoern Malte Schaefer

摘要:

暗能量可以通过它对宇宙膨胀的影响以及对大尺度结构生长历史的影响来研究。在本文中,我们跟踪宇宙密度场的增长,在早期暗能量宇宙学相结合的观测初级CMB的温度和偏振功率谱在高红移,在中等红移的CMB透镜偏转场和弱宇宙剪切在低红移限制早期暗能量的允许量。我们提出这些预测使用费舍尔矩阵形式主义,并考虑普朗克数据与弱透镜调查的欧几里得。我们发现,结合这些数据集提供了强大的约束早期暗能量,并能够打破退化的参数集固有的各种观测渠道。早期暗能量密度参数的1-σ界为σ(Omega_d^e)=0.0022,这表明早期暗能量模型可以在我们的方法中得到很好的检验。此外,我们得出的暗能量的品质因数所考虑的暗能量参数化和评论的适用性的增长指数早期暗能量宇宙学。

英文摘要:

Dark energy can be studied by its influence on the expansion of the Universe as well as on the growth history of the large-scale structure. In this paper, we follow the growth of the cosmic density field in early dark energy cosmologies by combining observations of the primary CMB temperature and polarisation power spectra at high redshift, of the CMB lensing deflection field at intermediate redshift and of weak cosmic shear at low redshifts for constraining the allowed amount of early dark energy. We present these forecasts using the Fisher-matrix formalism and consider the combination of Planck-data with the weak lensing survey of Euclid. We find that combining these data sets gives powerful constraints on early dark energy and is able to break degeneracies in the parameter set inherent to the various observational channels. The derived statistical 1-sigma-bound on the early dark energy density parameter is sigma(Omega_d^e)=0.0022 which suggests that early dark energy models can be well examined in our approach. In addition, we derive the dark energy figure of merit for the considered dark energy parameterisation and comment on the applicability of the growth index to early dark energy cosmologies.

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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