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  1. We derive the one-loop perturbative formula of the redshift-space matter power spectrum after density field reconstruction in the Zeldovich approximation. We find that the reconstruction reduces the amplitudes of nonlinear one-loop perturbative terms significantly by partially erasing the nonlinear mode-coupling between density and velocity fields. In comparison with N-body simulations, we ...
    Author:Chiaki Hikage, Kazuya Koyama, Ryuichi TakahashiPublished:2020
  2. researchgate.net

    Download Citation | Perturbation theory for the redshift-space matter power spectra after reconstruction | We derive the one-loop perturbative formula of the redshift-space matter power spectrum ...
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  4. link.aps.org

    We explore the covariance of redshift-space matter power spectra after a standard density-field reconstruction. We derive perturbative formula of the covariance at the tree-level order and find that the amplitude of the off-diagonal components from the trispectrum decreases by reconstruction.
    Author:Chiaki Hikage, Ryuichi Takahashi, Kazuya KoyamaPublished:2020
  5. researchgate.net

    Hikage et al. (2017); Hikage et al. (2020) used the standard perturbation (PT) to 1-loop and derived a model for the post-reconstruction real-space and redshift-space matter power spectrum ...
  6. The 2-point correlation function in redshift space is then de ned by ˘s 2 (r) = h (s+ r) (s)i (2.4) and its Fourier transform, Ps (k; ) = Z d3r˘s 2 (r)exp( ikr); (2.5) is the power spectrum in redshift space. Here, k^ k^ 3 is the cosine of the angle between the vector k and the line-of-sight. The redshift space power spectrum, can also be ...
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  8. the linear, real space matter power spectrum to the nonlinear, anisotropic redshift space power spectrum to an accuracy of ˘2-5% in the range k= 0:1 0:5h/Mpc for z= 0 2. As a by-product we derive RealEasy, an analytic mapping to the nonlinear, real space matter power spectrum (i.e. an analog to Halo t) to ˘1% accuracy over the same range.
  9. link.aps.org

    We derive the one-loop perturbative formula of the redshift-space matter power spectrum after density field reconstruction in the Zeldovich approximation. We find that the reconstruction reduces the amplitudes of nonlinear one-loop perturbative terms significantly by partially erasing the nonlinear mode coupling between density and velocity fields.
  10. link.aps.org

    Theoretical modeling of the redshift-space power spectrum of galaxies is crucially important to correctly extract cosmological information from galaxy redshift surveys. The task is complicated by the nonlinear biasing and redshift space distortion (RSD) effects, which change with halo mass,
  11. inspirehep.net

    We derive the one-loop perturbative formula of the redshift-space matter power spectrum after density field reconstruction in the Zeldovich approximation. We find that the reconstruction reduces the amplitudes of nonlinear one-loop perturbative terms significantly by partially erasing the nonlinear mode coupling between density and velocity fields.
  12. The use of Eulerian 'standard perturbation theory' to describe mass assembly in the early universe has traditionally been limited to modes with k $\\lesssim$ 0.1 h/Mpc at z = 0. At larger k the SPT power spectrum deviates from measurements made using N-body simulations. Recently, there has been progress in extending the reach of perturbation theory to larger k using ideas borrowed from ...

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