REVIEW 8 cited by
Galaxy Power Spectrum Multipoles Covariance in Perturbation Theory
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
We compute the covariance of the galaxy power spectrum multipoles in perturbation theory, including the effects of nonlinear evolution, nonlinear and nonlocal bias, radial redshift-space distortions, arbitrary survey window and shot noise. We rewrite the power spectrum FKP estimator in terms of the usual windowed galaxy fluctuations and the fluctuations in the number of galaxies inside the survey volume. We show that this leads to a stronger super-sample covariance than assumed in the literature and causes a substantial leakage of Gaussian information. We decompose the covariance matrix into several contributions that provide an insight into its behavior for different biased tracers. We show that for realistic surveys, the covariance of power spectrum multipoles is already dominated by shot noise and super survey mode coupling in the weakly non-linear regime. Both these effects can be accurately modeled analytically, making a perturbative treatment of the covariance very compelling. Our method allows for the covariance to be varied as a function of cosmology and bias parameters very efficiently, with survey geometry entering as fixed kernels that can be computed separately using fast fourier transforms (FFTs). We find excellent agreement between our analytic covariance and that estimated from BOSS DR12 Patchy mock catalogs in the whole range we tested, up to $k=0.6$ h/Mpc. This bodes well for application to future surveys such as DESI and Euclid. The CovaPT code that accompanies this paper is available at https://github.com/JayWadekar/CovaPT
Forward citations
Cited by 8 Pith papers
-
Assessing the large-scale angular clustering of UNIONS Lyman Break Galaxies via cross-correlations
UNIONS Lyman-break galaxy auto-clustering is unusable at large scales due to imaging systematics, but LBG x CMB-lensing and LBG x quasar cross-spectra are measured robustly, with amplitudes consistent with predictions.
-
Large-scale Modeling of the Observed Power Spectrum Multipoles
Eq. (25) computes Yamamoto power-spectrum multipoles in linear theory as weighted sums of discrete spherical Fourier-Bessel power-spectrum modes, unifying wide-angle, redshift-evolution, window, and integral-constrain...
-
The Linear Point Standard Ruler with DESI DR1 and DR2 Data
Linear-point distance measurements on DESI DR1/DR2 galaxy samples agree with template-based BAO measurements once a cosmology-dependent smearing correction is applied.
-
Unbiased analysis of primordial non-Gaussianity: the multipoles of the full relativistic power spectrum
Integrated relativistic (lensing, ISW, time-delay) corrections to power-spectrum multipoles bias predicted f_NL constraints by ~3σ (Euclid) and ~20σ (MegaMapper); a bright-faint split partly offsets the luminosity-fun...
-
Fiducial-Cosmology-dependent systematics for the DESI 2024 Full-Shape Analysis
Changing the assumed fiducial cosmology in DESI DR1 full-shape mock analyses shifts inferred parameters by at most 0.22 sigma in full-modeling and 0.45 sigma in ShapeFit, both within the survey's statistical uncertainty.
-
Equivalence of the field-level inference and conventional analyses on large scales
A joint power spectrum, bispectrum and trispectrum analysis achieves the same precision on the density amplitude as field-level inference for halos on large scales.
-
Modeling Gravitational Wave Bias from 3D Power Spectra of Spectroscopic Surveys
Using mock gravitational wave catalogs built from the SDSS DR7 galaxy survey, the clustering bias of GW sources is most sensitive to host stellar mass, secondarily to star formation rate, and nearly insensitive to met...
-
Separating Angular and Radial Modes with Spherical-Fourier Bessel Power Spectrum on All Scales and Implications for Systematics Mitigation
A spherical Fourier-Bessel analysis of galaxy clustering lets survey analysts cut only the angular and radial modes contaminated by systematics, preserving large-scale modes that standard multipole analyses would discard.
Discussion (0). Sign in to comment.