Linear Nash-Greene fluctuations on the evolution of $S_8$ and $H_0$ tensions

Capistrano, Abraão J. S.; Cabral, Luís A.; Marão, José A. P. F.; Coimbra-Araújo, Carlos H.

doi:10.48550/arxiv.2009.02167

Cited by 1 publication

(1 citation statement)

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“…On the other hand, if we decide to trust the current measurements, the tension would be suggestive of a shortcoming of the theory used to analyse the aforementioned data, such as new physics beyond the standard model (e.g. Mörtsell & Dhawan 2018;Capistrano et al 2020;Abellan et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Geometry vs growth: Internal consistency of the flat ΛCDM model with KiDS-1000

Ruiz-Zapatero,

Stölzner,

Joachimi

et al. 2021

Preprint

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We carry out a multi-probe self-consistency test of the flat ΛCDM model with the aim of exploring potential causes of the reported tensions between high-and low-redshift cosmological observations. We divide the model into two theory regimes determined by the smooth background (geometry) and the evolution of matter density fluctuations (growth), each governed by an independent set of ΛCDM cosmological parameters. This extended model is constrained by a combination of weak gravitational lensing measurements from the the Kilo-Degree Survey, galaxy clustering signatures extracted from Sloan Digital Sky Survey campaigns and the Six-Degree Field Galaxy Survey, as well as the angular baryon acoustic scale and the primordial scalar fluctuation power spectrum measured in Planck cosmic microwave background (CMB) data. For both the weak lensing data set individually and the combined probes, we find strong consistency between the geometry and growth parameters, and with the posterior of standard ΛCDM analysis. Tension in the amplitude of matter density fluctuations as measured by the parameter S 8 persists at around 3σ, with a 1.5 % constraint of S 8 = 0.776 +0.016 −0.008 for the combined probes. We also observe less significant trends (at least 2σ) towards higher values of the Hubble constant H 0 = 70.5 +0.7 −1.5 km s −1 Mpc −1 and towards lower values of the total matter density parameter Ω m = 0.289 +0.007 −0.005 compared to the full Planck analysis. Including the subset of the CMB information in the probe combination enhances these differences rather than alleviate them, which we link to the discrepancy between low and high multipoles in Planck data. Our analysis does not yet yield clear signs whether the origin of discrepancies lies in ΛCDM structure growth or expansion history, but holds promise as an insightful test for forthcoming more powerful data.

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Section: Introductionmentioning

confidence: 99%