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arXiv 1202.5804astro-ph.CO
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宇宙潮汐

Cosmic Tides

Ue-Li Pen, Ravi Sheth, J. Harnois-Deraps, Xuelei Chen, Zhigang Li

摘要:

我们将CMB透镜技术应用于大尺度结构,求解了三维宇宙潮汐场。我们用小尺度的潮汐结构来求解大尺度的潮汐切变和重力位。通过将其与红移空间密度场进行比较,可以在没有宇宙方差的情况下测量大尺度上的引力增长因子。这可能使中微子质量的准确测量和重建的径向模式丢失在21厘米强度映射,这是必不可少的CMB和其他交叉相关。我们与潮汐场的压缩极限双谱,并提出了初步的模拟结果和数据从SDSS。

英文摘要:

We apply CMB lensing techniques to large scale structure and solve for the 3-D cosmic tidal field. We use small scale filamentary structures to solve for the large scale tidal shear and gravitational potential. By comparing this to the redshift space density field, one can measure the gravitational growth factor on large scales without cosmic variance. This potentially enables accurate measurements of neutrino masses and reconstruction of radial modes lost in 21 cm intensity mapping, which are essential for CMB and other cross correlations. We relate the tidal fields to the squeezed limit bispectrum, and present initial results from simulations and data from the SDSS.

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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