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  1. 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
  2. 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. Using a large set of N-body simulations, we also find the similar reduction of the off-diagonal ...
    Author:Chiaki Hikage, Ryuichi Takahashi, Kazuya KoyamaPublished:2020
  3. researchportal.port.ac.uk

    Covariance of the redshift-space matter power spectrum after reconstruction. Chiaki Hikage, Ryuichi Takahashi, Kazuya ... the post-rec spectra have higher S/N than the linear spectrum with Gaussian covariance when the scale of reconstruction characterized with the smoothing scale of the shift field is below ~10Mpc/h where the trispectrum ...
    Author:Chiaki Hikage, Ryuichi Takahashi, Kazuya KoyamaPublished:2020
  4. researchgate.net

    (4) For the redshift-space power spectrum, the degradation in S/N by non-Gaussian errors is mitigated due to nonlinear redshift distortions; (5) for an actual galaxy survey, the additional shot ...
  5. researchgate.net

    Interestingly, the post-rec spectra have higher S/N than the linear spectrum with Gaussian covariance when the scale of reconstruction characterized with the smoothing scale of the shift field is ...
  6. renfrewshireastro.co.uk

    taking into account the super-sample covariance, while the reconstruction cannot correct for the field variation of the super-sample modes. 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 ...
  7. Jun 5, 2023Download a PDF of the paper titled On approximations of the redshift-space bispectrum and power spectrum multipoles covariance matrix, by Sergi Novell-Masot and 2 other authors ... Abstract: We investigate, in dark matter and galaxy mocks, the effects of approximating the galaxy power spectrum-bispectrum estimated covariance as a diagonal ...
  8. researchportal.port.ac.uk

    Data availability statement for 'Covariance of the redshift-space matter power spectrum after reconstruction'. Hikage, C. (Creator), Takahashi, R. (Creator) & Koyama, K. (Creator), American Physical Society, 22 Sept 2020. Dataset
  9. link.aps.org

    Monopoles and quadrupoles of simulated redshift-space matter power spectrum (filled circles) before (left) and after (right) reconstruction at z = 1.02 (upper) and z = 0 (lower). For comparison, we plot the one-loop SPT (solid lines) with two counterterms proportional to P ℓ ( lin ) ( k ) k 2 fitted to the simulated spectra up to k = 0.2 h ...
  10. academic.oup.com

    In this subsection, we provide analytical calculations of the unconnected parts of the covariance. We begin with the simplest case, the power spectrum covariance, in Section 3.2.1. We will then extend it to the cross-covariance between P and B, and the autobispectrum covariance in Sections 3.2.2 and 3.2.3. 3.2.1 Power spectrum covariance

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