$${\sigma }_{8}$$ Tension. Is Gravity Getting Weaker at Low z? Observational Evidence and Theoretical Implications

@article{Kazantzidis2021sigmaT,
  title={\$\$\{\sigma \}\_\{8\}\$\$ Tension. Is Gravity Getting Weaker at Low z? Observational Evidence and Theoretical Implications},
  author={Lavrentios Kazantzidis and Leandros Perivolaropoulos},
  journal={Modified Gravity and Cosmology},
  year={2021}
}
Dynamical observational probes of the growth of density perturbations indicate that gravity may be getting weaker at low redshifts $z$. This evidence is at about $2-3\sigma$ level and comes mainly from weak lensing data that measure the parameter $S_8=\sigma_8 \sqrt{\Omega_{0m}/0.3}$ and redshift space distortion data that measure the growth rate times the amplitude of the linear power spectrum parameter $f\sigma_8 (z)$. The measured $f\sigma_8$ appears to be lower than the prediction of… 
$\theta_{\rm BAO}$ estimates and the $H_0$ tension
An observational tension on estimates of the Hubble parameter, $H_0$, using early and late Universe information, is being of intense discussion in the literature. Additionally, it is of great
Tension of the EG statistic and redshift space distortion data with the Planck - ΛCDM model and implications for weakening gravity
The $E_G$ statistic is a powerful probe for detecting deviations from GR by combining weak lensing (WL), real-space clustering and redshift space distortion (RSD) measurements thus probing both the
An Overview of Nonstandard Signals in Cosmological Data
We discuss in a unified manner many existing signals in cosmological and astrophysical 1 data that appear to be in some tension (2σ or larger) with the standard ΛCDM as defined by the 2 Planck18
New physics in light of the H0 tension: An alternative view
The strong discrepancy between local and early-time (inverse distance ladder) estimates of the Hubble constant H0 could be pointing towards new physics beyond the concordance ΛCDM model. Several
The Hubble Tension, the M Crisis of Late Time H(z) Deformation Models and the Reconstruction of Quintessence Lagrangians
We present a detailed and pedagogical analysis of recent cosmological data, including CMB, BAO, SnIa and the recent local measurement of H0. We thus obtain constraints on the parameters of these
A Bayesian interpretation of inconsistency measures in cosmology
Measures of inconsistency and tension between datasets have become an essential part of cosmological analyses. It is important to accurately evaluate the significance of such tensions when present.
Remarks on measures of inconsistency
Some inconsistencies between cosmological observations continue to persist. The currently reported inconsistencies can be due to problems with the underlying model or systematic effects associated
Hubble tension or a transition of the Cepheid SnIa calibrator parameters?
We re-analyze the Cepheid data used to infer the value of the Hubble constant H0 by calibrating Type Ia supernovae. We do not enforce a universal value of the empirical Cepheid calibration parameters
Late-transition vs smooth $H(z)$ deformation models for the resolution of the Hubble crisis
George Alestas, ∗ David Camarena, † Eleonora Di Valentino, ‡ Lavrentios Kazantzidis, § Valerio Marra, 5, 6, ¶ Savvas Nesseris, ∗∗ and Leandros Perivolaropoulos †† Department of Physics, University of
A structured analysis of Hubble tension
As observations of the Hubble parameter from both early and late sources have improved, the tension between these has increased to be well above the 5σ threshold. Given this, the need for an
...
1
2
3
...

References

SHOWING 1-10 OF 143 REFERENCES
A hint of matter underdensity at low z?
The $\Lambda$CDM cosmological model provides to first approximation a good description of the universe, but various tensions with data, most notably Hubble tension, persist. In this work we confront
Testing dark energy models in the light of $$\sigma _8$$σ8 tension
It has been pointed out that there exists a tension in $$\sigma _8-\varOmega _m$$σ8-Ωm measurement between CMB and LSS observation. In this paper we show that $$\sigma _8-\varOmega _m$$σ8-Ωm
The trouble with $H_0$
We perform a comprehensive cosmological study of the $H_0$ tension between the direct local measurement and the model-dependent value inferred from the Cosmic Microwave Background. With the recent
When is the growth index constant
The growth index $\gamma$ is an interesting tool to assess the phenomenology of dark energy (DE) models, in particular of those beyond general relativity (GR). We investigate the possibility for DE
Cosmological Tests of Gravity with the Latest Observations
We perform observational tests of modified gravity on cosmological scales following model-dependent and model-independent approaches using the latest astronomical observations, including measurements
Sample variance in the local measurements of the Hubble constant
The current $>3\sigma$ tension between the Hubble constant $H_0$ measured from local distance indicators and from cosmic microwave background is one of the most highly debated issues in cosmology, as
KiDS-450: testing extensions to the standard cosmological model
We test extensions to the standard cosmological model with weak gravitational lensing tomography using 450 deg$^2$ of imaging data from the Kilo Degree Survey (KiDS). In these extended cosmologies,
Density perturbations for running vacuum: a successful approach to structure formation and to the σ8-tension
Recent studies suggest that dynamical dark energy (DDE) provides a better fit to the rising affluence of modern cosmological observations than the concordance model ($\Lambda$CDM) with a rigid
Relaxing the σ 8 -tension through running vacuum in the Universe
It has recently been shown that the class of running vacuum models (RVMs) has the capacity to fit the overall cosmological observations better than the concordance $\Lambda$CDM model, therefore
Relativistic effects and dark matter in the Solar system from observations of planets and spacecraft
The high precision of the latest version of the planetary ephemeris EPM2011 enables one to explore more accurately a variety of small effects in the solar system. The processing of about 678 thousand
...
1
2
3
4
5
...