Constraints on Newton’s constant from cosmological observations

Wang, Ke; Chen, Lu

doi:10.1140/epjc/s10052-020-8137-x

Cited by 20 publications

(14 citation statements)

References 54 publications

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“…However, in 1937, Dirac (1937 argued that the fundamental constants of nature may not be pure constants but may vary slowly with the epoch, and he proposed a gravitational constant decreasing proportionally to t −1 . Since then, some theoretical and experimental investigations allowing spacetime variation of fundamental constants have been put into effect (Uzan 2011(Uzan , 2003Martins 2017;Wang & Chen 2020). In order to remedy the dire consequence (Teller 1948) induced by the varying gravitational constant G ∼ t −1 , Gamow (1967) suggested that e 2 increases in direct proportion to the age of the universe.…”

Section: Introductionmentioning

confidence: 99%

Probing the Time Variation of a Fine Structure Constant Using Galaxy Clusters and the Quintessence Model

Liu

Zhang

et al. 2021

ApJ

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We explore a possible time variation of the fine structure constant (α ≡ e 2/ℏ c) using the Sunyaev–Zel’dovich effect measurements of galaxy clusters along with their X-ray observations. Specifically, the ratio of the integrated Comptonization parameter Y SZ D A 2 and its X-ray counterpart Y X is used as an observable to constrain the bounds on the variation of α. Considering the violation of the cosmic distance duality relation, this ratio depends on the fine structure constant of ∼ α 3. We use the quintessence model to provide the origin of α time variation. In order to give a robust test on α variation, two galaxy cluster samples, the 61 clusters provided by the Planck collaboration and the 58 clusters detected by the South Pole Telescope (SPT), are collected for analysis. Their X-ray observations are given by the XMM-Newton survey. Our results give ζ = − 0.203 − 0.099 + 0.101 for the Planck sample and ζ = − 0.043 − 0.148 + 0.165 for the SPT sample, indicating that α is constant with redshift within 3σ and 1σ for the two samples, respectively.

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Section: Introductionmentioning

confidence: 99%

Probing the Time Variation of a Fine Structure Constant Using Galaxy Clusters and the Quintessence Model

Liu

Zhang

et al. 2021

ApJ

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“…These analysis were repeated later, with updated measurement of G after the first Planck release [50], confirming that G/G N = 1. Recently, there have been works using BNN data [51] or adding to the CMB local data such as BAO or SNIa measurements, [52].…”

Section: Introductionmentioning

confidence: 99%

Can varying the gravitational constant alleviate the tensions ?

Sakr,

Sapone

2021

Preprint

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Constraints on the cosmological concordance model parameters from observables at different redshifts are usually obtained using the locally measured value of the gravitational constant G N . Here we relax this assumption, by considering G as a free parameter, either constant over the redshift range or dynamical but limited to differ from fiducial value only above a certain redshift. Using CMB data and distance measurements from galaxy clustering BAO feature, we constrain the cosmological parameters, along with G, through a MCMC bayesian inference method. Furthermore, we investigate whether the tensions on the matter fluctuation σ 8 and Hubble H 0 parameter could be alleviated by this new variable. We used different parameterisations spanning from a constant G to a dynamical G. In all the cases investigated in this work we found no mechanism that alleviates the tensions when both CMB and BAO data are used with ξ g = G/G N constrained to 1.0±0.04 (resp. ±0.01) in the constant (resp. dynamical) case. Finally, we studied the cosmological consequences of allowing a running of the spectral index, since the later is sensitive to a change in G. For the two parameterisations adopted, we found no significant changes to the previous conclusions.

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“…3)×10 −5 and β P N −1 = (4.1 ± 7.8)× 10 −5 at 68% CL [34,35]. Other studies of a varying cosmological constant place constraints on its value and its variation rate [36,37]. Recent analysis, Ref.…”

Section: Modelmentioning

confidence: 98%

Can Conformally Coupled Modified Gravity Solve The Hubble Tension?

Abadi,

Kovetz

2020

Preprint

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The discrepancy between early-Universe and direct measurements of the Hubble constant, known as the Hubble tension, recently became a pressing subject in high precision cosmology. As a result, a large variety of theoretical models have been proposed to relieve this tension. In this work we analyze a conformally-invariant modified gravity (CIMG) model of an evolving gravitational constant due to the coupling of a scalar field to the Ricci scalar, which is theoretically advantageous as it has only one free parameter and its influence is concentrated around matter-radiation equality, as required for solutions to the Hubble tension based on increasing the sound horizon at recombination. Inspired by similar recent analyses of so-called early-dark-energy models, we constrain the CIMG model using a combination of early and late-Universe cosmological datasets. In addition to the Planck 2018 cosmic microwave background (CMB) anisotropies and weak lensing measurements, baryon acoustic oscillations and the Supernova H0 for the Equation of State datasets, we also use large-scale structure (LSS) datasets such as the Dark Energy Survey year 1 and the full-shape power spectrum likelihood from the Baryon Oscillation Spectroscopic Survey, including its recent analysis using effective field theory, to check the effect of the CIMG model on the (milder) S8 tension between the CMB and LSS. We find that the CIMG model can slightly relax the Hubble tension, with H0 = 69.6 ± 1.6 km/s/Mpc at 95% CL, while barely affecting the S8 tension. However, current data does not exhibit strong preference for CIMG over the standard cosmological model. Lastly, we show that the planned CMB-S4 experiment will have the sensitivity required to distinguish between the CIMG model and the more general class of models involving an evolving gravitational constant.

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Constraints on Newton’s constant from cosmological observations

Cited by 20 publications

References 54 publications

Probing the Time Variation of a Fine Structure Constant Using Galaxy Clusters and the Quintessence Model

Probing the Time Variation of a Fine Structure Constant Using Galaxy Clusters and the Quintessence Model

Can varying the gravitational constant alleviate the tensions ?

Can Conformally Coupled Modified Gravity Solve The Hubble Tension?

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