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arXiv 1711.03218astro-ph.CO
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红移空间畸变的非线性重建

Nonlinear reconstruction of redshift space distortions

Hong-Ming Zhu, Yu Yu, Ue-Li Pen

摘要:

对红移空间中的暗物质密度场进行非线性重构,求解从初始拉格朗日位置到最终红移空间位置的非线性映射。从非线性位移推断的重建各向异性场与线性初始条件的相关性比红移空间密度场小得多。在密度场中的线性模式的数目在重建后被提高了30-40倍。因此,我们期望这种重建方法,以大大扩大宇宙学信息,包括重子声学振荡和红移空间扭曲的密集低红移大尺度结构调查,包括例如SDSS主样品,DESI BGS,和21厘米强度映射调查。

英文摘要:

We apply nonlinear reconstruction to the dark matter density field in redshift space and solve for the nonlinear mapping from the initial Lagrangian position to the final redshift space position. The reconstructed anisotropic field inferred from the nonlinear displacement correlates with the linear initial conditions to much smaller scales than the redshift space density field. The number of linear modes in the density field is improved by a factor of 30-40 after reconstruction. We thus expect this reconstruction approach to substantially expand the cosmological information including baryon acoustic oscillations and redshift space distortions for dense low-redshift large scale structure surveys including for example SDSS main sample, DESI BGS, and 21 cm intensity mapping surveys.

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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