Nonlinear reconstruction of redshift space distortions.
We apply nonlinear reconstruction to the dark matter density field in redshift space and solve for the nonlinear mapping from the initial Lagrangian positions to the final redshift space positions. 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 $30\sim40$ after reconstruction. We thus expect this reconstruction approach to substantially expand the cosmological information including BAO and RSD for dense low-redshift large scale structure surveys including for example SDSS main sample, DESI BGS, and 21 cm intensity mapping surveys.
Publisher URL: http://arxiv.org/abs/1711.03218
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