Cosmic shear analysis in 50 uncorrelated VLT fields. Implications for $\Omega_0$, $\sigma_8$ [PDF]
Astronomy & Astrophysics, 2001 11 pages, 8 figures, Submitted to A& ...
MAOLI, Roberto +7 more
openaire +4 more sources
Robust Field-level Inference of Cosmological Parameters with Dark Matter Halos
The Astrophysical Journal, 2023 We train graph neural networks on halo catalogs from Gadget N -body simulations to perform field-level likelihood-free inference of cosmological parameters. The catalogs contain ≲5000 halos with masses ≳10 ^10 h ^−1 M _⊙ in a periodic volume of ${(25\,{h}
Helen Shao +15 more
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Dark Matter Cosmology with Varying Viscosity: A Possible Resolution to the S 8 Tension
The Astrophysical Journal, 2023 We study varying forms of viscous dark matter (DM) and try to address the intriguing tensions of the standard model of cosmology with recent cosmological data, including the Hubble and S _8 tensions.
Amjad Ashoorioon, Zahra Davari
doaj +1 more source
Measuring 8 with Cluster Lensing: Biases from Unrelaxed Clusters [PDF]
The Astrophysical Journal, 2003 Submitted to Astrophysical Journal Letters, 4 pages, 2 ...
Smith, Graham P. +5 more
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Is the Large-scale Structure Traced by the BOSS LOWZ Galaxies Consistent with Planck?
The Astrophysical Journal Letters, 2023 Recently, several studies reported a significant discrepancy between the clustering and lensing of the Baryon Oscillation Spectroscopic Survey (BOSS) galaxies in the Planck cosmology. We construct a simple yet powerful model based on the linear theory to
Zhiwei Shao, Ying Zu, Huanyuan Shan
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Cosmological constraints from the cluster contribution to the power spectrum of the soft X-ray background. New evidence for a low sigma8 ? [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 14 pages, 19 plots (2 as gif files).
Diego, J. M. +4 more
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Accurate Weak Lensing of Standard Candles. II. Measuring sigma8 with Supernovae
, 2013 Soon the number of type Ia supernova (SN) measurements should exceed 100,000. Understanding the effect of weak lensing by matter structures on the supernova brightness will then be more important than ever. Although SN lensing is usually seen as a source of systematic noise, we will show that it can be in fact turned into signal.
Quartin, Miguel +2 more
openaire +2 more sources
Cosmological Constraints from Full-scale Clustering and Galaxy–Galaxy Lensing with DESI DR1
The Astrophysical JournalWe present constraints on cosmic structure growth from the analysis of galaxy clustering and galaxy–galaxy lensing with galaxies from the Dark Energy Spectroscopic Instrument (DESI) Data Release 1. Our analysis includes four samples drawn from the Bright
J. U. Lange +78 more
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Exploring the S8 Tension: Insights from the CatNorth 1.5 Million Quasar Candidates
The Astrophysical JournalThe parameter S _8 , a key probe of cosmic structure growth, exhibits a persistent ∼3 σ tension between high-redshift measurements from cosmic microwave background (CMB) anisotropies and low-redshift weak gravitational lensing observations.
Jin Qin +6 more
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The Astrophysical JournalWe present tomographic measurements of structure growth using cross-correlations of Atacama Cosmology Telescope (ACT) DR6 and Planck cosmic microwave background (CMB) lensing maps with the unWISE Blue and Green galaxy samples, which span the redshift ...
Gerrit S. Farren +36 more
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