REVIEW 7 cited by
The growth of density perturbations in the last $\sim$10 billion years from tomographic large-scale structure data
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
In order to investigate the origin of the ongoing tension between the amplitude of matter fluctuations measured by weak lensing experiments at low redshifts and the value inferred from the cosmic microwave background anisotropies, we reconstruct the evolution of this amplitude from $z\sim2$ using existing large-scale structure data. To do so, we decouple the linear growth of density inhomogeneities from the background expansion, and constrain its redshift dependence making use of a combination of 6 different data sets, including cosmic shear, galaxy clustering and CMB lensing. We analyze these data under a consistent harmonic-space angular power spectrum-based pipeline. We show that current data constrain the amplitude of fluctuations mostly in the range $0.2<z<0.7$, where it is lower than predicted by Planck. This difference is mostly driven by current cosmic shear data, although the growth histories reconstructed from different data combinations are consistent with each other, and we find no evidence of systematic deviations in any particular experiment. In spite of the tension with Planck, the data are well-described by the $\Lambda$CDM model, albeit with a lower value of $S_8\equiv\sigma_8(\Omega_m/0.3)^{0.5}$. As part of our analysis, we find constraints on this parameter of $S_8=0.7781\pm0.0094$ (68\% confidence level), reaching almost percent-level errors comparable with CMB measurements, and 3.4$\sigma$ away from the value found by Planck.
Forward citations
Cited by 7 Pith papers
-
Analytical covariances for catalogue-based pseudo-$C_\ell$s
A new analytic method computes disconnected covariance matrices for catalogue-based pseudo-Cℓ power spectra by smoothing source positions and treating self-pair shot noise exactly.
-
Pixelization effects in cosmic shear angular power spectra
Pixelization biases in pseudo-C_ell cosmic shear estimators are modeled from first principles, including a spin-2 HEALPix window derivation and empty-pixel corrections.
-
Cosmology from Planck CMB Lensing and DESI DR1 Quasar Tomography
DESI DR1 quasars cross-correlated with Planck PR4 lensing give sigma8 = 0.929 and S8 = 0.922, about 1.5 sigma above Planck's LCDM prediction, and a sound-horizon-free H0 = 69.1 km/s/Mpc.
-
Tuning the cosmic instrument: robust cosmology through combined probes
Low-redshift large-scale structure data pull the dark-energy equation-of-state posterior toward a cosmological constant and yield S8=0.777±0.017.
-
Growth, geometry, and early-universe split of the matter density parameter $\Omega_{\rm m}$
Splitting Ω_m into geometry, growth, and early-universe regimes yields mutually compatible values, yet ΔΩ_m^{geo,early} is 2σ from zero under combined DES, Planck (scale-cut), DESI, Pantheon+, and RSD data.
-
Low-redshift constraints on structure growth from CMB lensing tomography
Low-redshift galaxy clustering and CMB lensing tomography with hybrid effective field theory gives S8=0.79±0.06, consistent with Planck, while data alone prefer Ωm=0.245±0.024.
-
Is $\omega_0 \omega_a$CDM a good model for the clumpy Universe?
Against a Gaussian-process reconstruction of 15 sigma8(z) measurements, the DESI w0waCDM model fits slightly better than LambdaCDM, but the difference is tiny and the comparison metric is biased.
Discussion (0). Continue with ORCID to comment.